As much as I love doing small builds, a big sprawling Sim family needs a big sprawling sim house. Hopefully, Modernity fits the bill.
This lot includes:
work out loft
large party patio with bar
Modernity costs $164k (or 3 motherlodes...lol!) and fits a 30x40 lot or larger. Find it in The Sims 4 Gallery under my Origin user name: ruthless_kk