I know quite a few families of four that are living in 3000+ sq foot houses.
I have to ask WTF? Do you really need all that space? It ends up being nothing but alot of open space to heat/cool and alot of surfaces for your maid to clean.
My friends master suite/bath/walk in closet/retreat are at least 3/4 of the size of my whole 1100 sq foot house….