I would have criminalized “owning residences you don’t live in”.
I own one my mom lives in… Not everything is that simple.
Making an exception for family members isn’t that hard, either, though. And even if we did do it like this, it would probably end up being a net positive for society - maybe people’s moms could actually afford owning houses if no one owned more than one house.
All people are my brothers and sisters, even the peasants living in the slums I own.