First, you'll need a mystery. Write one yourself, or download one inexpensively from a mystery game website (such as host-party.com). It's best if the murder itself (or jewel heist, if you have young children) has taken place before dinner starts so everyone can dive right in.
Each family member is assigned a role. Typically, each gets one clue she's allowed to (and should) tell people freely, and one she's supposed to hide. If she's asked about it, she can change the subject or refocus the conversation, but she's never allowed to lie.
It helps if you set the stage. Theme-appropriate lighting, decorations and food makes it more fun for everyone. You can even let family members know who they're playing ahead of time so they can dress up.
At dinner, everyone stays in character. They can talk about anything they'd like, but as their characters. The only rule is that they should tell their OK-to-reveal clues to at least one person.
At dessert, ask each family member what he thinks happened. After everyone has weighed in, discuss the case until everyone's in agreement. Then you, as the inspector, can tell them if they've managed to figure out whodunnit.
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