Like in my previous question my ex is a drunk and I thought that alone should be enough to prove my kids are in a dangerous situation but it wasn't,how do I prove it isn't a good environment?He has ni dl either

Have a police report of where he harmed one of the children or put one in eminent danger.

Calling him a drunk... even with his DUIs... doesn't make him an unfit father... just an unfit driver.