For what it’s worth, my brother in law went through something similar with his ex. She tried framing him as irresponsible and always partying by doing things like taking pics of the trash after family events and stuff. He kept records of everything, wrote down every time she came up with an excuse not to give him visiting time (and for a while he had to travel halfway across the US, would take a flight for the weekend every month, for years). After presenting everything to the court, he now has full custody. Good luck.