House mobile home and grandfather laws question

[Ross Broussard]

I was wondering if anyone has had any experience with the grandfather laws regarding a property that has a mobile home as well as a house.My wife’s father(who was an electrician and handyman) passed away. He has a property that she is going to inherit that originally had two mobile homes on it but he replaced the mobile home in the front with a house that he built(without pulling permits or getting it rezoned). We aren’t too worried with the the safety or anything with the house because all the work was done by him and his friends who were certified and licensed  craftsmen. We just aren’t sure what to do or if it’s ok to just fix up the homes and just start renting them out. Any advice would be appreciated.