In "The Sims" series, the most members in a household you can have is 8.

In The Sims game series, players are able to create and control simulated households consisting of various characters called 'Sims'. One aspect of household management is determining the maximum number of Sims that can reside together under one roof. In all versions of the game, including the latest installment, The Sims 4, released in 2014, the player can only accommodate a maximum of eight Sims in a single household. This limit includes children, teens, adults, seniors, pets, and any other playable Sim types available in the particular version of the game.