How to Host a Murder Mystery for a Mixed-Age Family Gathering

A MortalCase game runs 2.5–3 hours and gives every person in the room the same job for the whole of it, which is rarer at a family gathering than it sounds. The work is all in what you do beforehand: which game you buy, who you cast as the 8 Primary Characters, and what you say in the first 5 minutes. Get those right and the shy 14-year-old and the uncle who talks over everybody both have a good night.

You’re hosting the family, and you already know how the afternoon goes. The teenagers end up by the window with their phones, the grandparents end up in the good chairs, and you spend the day walking between the 2 groups making conversation on other people’s behalf.

A MortalCase murder mystery is rated PG-13 and plays with 8 to 20 guests, which covers most family gatherings without anybody being sent to a children’s table. Each game also carries a note that the story contains some adult themes, so you get to read both lines before you decide who to invite.

A murder mystery is one of the few things that solves it. Everyone gets the same amount of information, nobody has an advantage, and a teenager who has been quiet all day turns out to be extremely good at lying to their aunt. But it only works if you get 2 things right before anyone arrives: which game you choose, and how clearly you explain what is about to happen.

A family that gathers in December gets the setting for free. Your aunt and your 14-year-old both know what a North Pole party looks like, so Who Killed Santa’s Wife? asks nobody at the table to learn a new world before they can join in.

Check the specific game before you invite anybody

This is the step that decides whether a mixed-age party works. It’s a question about the 1 game you’re buying rather than about murder mysteries in general.

Plan for 13 and over as the general floor in a MortalCase game. Above that, each game carries its own rating, and the ratings differ:

The games are rated PG-13, and every one of them notes that the story contains some adult themes. That combination is the thing to read carefully: a PG-13 rating tells you the floor, and the note tells you there’s grown-up material in the story regardless.

Beyond the rating there’s 1 option worth knowing about. A Killer Disco Party also includes a Clean Game Kit that can make the game suitable for younger adults, and it’s the only game that has one, so don’t assume the same option exists elsewhere.

Read the rating and the note on the game you’re buying, then invite. Doing it the other way round is how a host ends up handing a Character Guide to a 14-year-old at the table.

These are written for adults, and I’d say that plainly rather than let a rating do it for me. What changed is that enough hosts told me they were running one for older teenagers that every game now ships with a bonus host guide called Adults Hosting for Teens. The audience didn’t move. The help caught up with what people were already doing.

Tell everyone what freeplay means

Mixed-age groups contain the widest possible range of expectations about what “murder mystery” means. Somebody is imagining a board game. Somebody else is dreading being asked to perform.

Say it plainly in the invitation: there’s no script, nothing to memorise, and no moment where the room watches you deliver a line. You get a character with secrets and you talk to people. That 1 sentence removes most of the resistance you would otherwise get from the older relatives and all of the dread from the younger ones.

“Our teenage boys wanted to host a murder mystery party but wanted more clues than parts to read. This was perfect! Everything was easy to follow and all the kids had a blast. Highly recommend!”

More clues than parts to read is a good description of what freeplay feels like, and it’s why it suits a room where not everybody wants the same amount of attention. Nobody is being asked to perform; they’re being asked to find things out.

Cast by confidence, not by age

Every game has 20 characters: 8 required Primary Characters who carry the story and the 3 murders, and 12 optional Secondary Characters you cast as the guest list allows. Give the 8 Primaries to whoever will read their guide and enjoy being at the centre of something, regardless of how old they are. That’s often a teenager and often not the person you assumed. Give Secondary roles to anyone who would rather watch for the first half hour and join in when they’re ready. For socially anxious guests, the same casting question matters even more.

Do not hand the quiet 14-year-old a Secondary because they’re 14. Hand it to them because they told you they would rather ease in.

I split every game into 8 Primary Characters and 12 Secondary Characters for this exact reason. The 8 carry the story and the 3 murders, and the 12 are there so nobody has to be handed more of the evening than they want.

Make the opening unusually clear

In a mixed-age room the opening carries more weight than it does anywhere else, because half of your guests have never done this and are waiting to find out whether they’re about to be embarrassed. Cover 4 things and nothing else. There’s no script. Your secrets are yours to protect and lying is the point. Evidence will appear as the evening goes on and you’re meant to read it. Nobody wins by being loudest.

Then give an immediate first task so nobody has to invent a way to start: meet 3 characters and find one person your guide names as a relationship. Specific instructions move a mixed room far faster than encouragement does.

Read up on whether teens and adults can play the same murder mystery game before you decide how young your youngest player can be.

Support a hesitant guest privately

Somebody will stall. In a family that’s usually the person who was talked into coming, and the worst thing you can do is address it in front of everyone.

Go over quietly, look at their guide with them, and point at 1 concrete next action. Ask this person about that thing. Show this to somebody. Do not take over the character, don’t speak for them, and don’t announce to the room that they need help.

They almost always need 1 successful conversation rather than rescuing, and once they have had it they’re fine for the rest of the evening.

Keep the evidence public and the pacing visible

Put the evidence somewhere everybody can reach without asking permission. In a mixed-age group, anything that requires confidence to access will be used by the confident people only, and the whole point is that the information is shared equally. Quieter guests gain the most from that, and introverts do well at these parties when the room is built this way.

Say out loud when things happen, too. Announcing that the second murder is coming shortly, or that voting is in 20 minutes, keeps the people who are less sure about the format from feeling lost.

Everyone gets a role of their own, whichever end of the age range they’re sitting at. You’ll find the themes in my Etsy shop, and the family will have opinions about which one you pick.

Serve food that lets people move

Sit a mixed-age family down at a table and they will re-form into the groups they were already in, which is the thing the game is supposed to break up. Keep the food standing and one-handed, and put the drinks somewhere separate from the evidence. Save something sweet for after the Reveal, so there’s a reason for everyone to stay in the room and argue. The fuller version is in murder mystery party food and drink ideas.

Give the family a shared ending

Set aside 2.5–3 hours for a MortalCase murder mystery game, with some give in it, so plan the start time from when the youngest or the earliest-leaving guests will fade.

Then finish it properly. Everybody votes, including the people who have no idea. The Reveal names the killer and explains the motives behind all 3 murders, and the guest playing the killer delivers the ending from inside the story.

That shared ending is the actual reason this works on a family. For once, everyone in the room has been doing the same thing all evening, and everybody finds out the answer at the same second. If it goes well, do it again at Christmas. There’s a version of this for hosting a Christmas murder mystery party too.

Run the same evening for a big birthday and one job gets added, since a milestone birthday murder mystery has to keep the guest of honor in the party instead of on refill duty.