MB Families are a tradition on the SAMB, in which MBers start a 'family', a group of users, often with certain traits, united under the family's name. Some MBers are in multiple families, while other families make their members only have one.

There are three main families on The SAMB: The Cahills( Mainly prominent on the 39 clues MB), The Yzarcs, and the Immortal Children. Some minor families include the Aimables, Stretiks, Saryns and the Desitjos. However, recently a new family, the Forjaekkals, created by FrostPi, started growing. For a detailed description of each family, please check their respective pages.