Too many cases x_X

Fun fact: When you are a Serb reading this sentence naively, trying to translate word for word, you get "Oni su u mojoj mami", which means "They are inside my mother".

cool that we have a kinda genitive case for pronouns, makes the polish genitive case easier to learn :)

So is 'u' used for people and 'przy' for inanimate objects?

i was told that 'over' -as in i am 'over' x person's house- would work as a translation here too?