My dad has always complained about his girlfriend kids but he's planning living with them will that last?

Thankfully i will have a job soon so o can leave. But I'm worried my dad jumps in into stupid decisions to quickly as he has been married twice and has a lot of girlfriend that didn't last very long. He's been with his current girlfriend but they live apart but I think it won't last because he's 58 where she's is 42 with very young kids and he already complains about them a lot. He seems to think that all her to look after them
My dad has always complained about his girlfriend kids but he's planning living with them will that last?
Post Opinion