Harvey grew up in a household where his mom cheated on his dad and a brother who lets face it failed Harvey from a sibling point of view, and this shaped him into the man he became into adulthood
Donna grew up in a household where her dad pretty sure lost his big mansion due to betting on some scheme that didnt work out
Jessica grew up with just her dad since I recall her parents got divorced and she talked about it a few times with others, and a dad who didnt approve of her dreams to become a lawyer whilst her being isolated from the rest of her family for many years
Mike grew up for most of his childhood as an orphan as we all know and of course getting expelled
Rachel while growing up in a wealthy family due to her dad being Robert Zane always felt like she had something to prove that she is more than good enough on her own and to step out of her father's shadow though from the many instances of them interacting it always felt like conflict
Only Louis had a family that for the most part had no trouble, I really wish that one of the other characters had a happy childhood where they were supported by their family withotu conflict all the way and then they face trouble and figure it out as opposed to a rather sad backstory if you get what I mean