For some, just because they want to is the reason they cut their parents off
60 years ago my uncle went to Australia without telling anyone, and nobody heard from him for 6 years. He eventually got in touch again and used to send me Australian gifts which I thought were really cool, like a book about a baby kangaroo, and a boomerang which I used to terrorise people in the local park with. He did really well for himself and became a law professor in Australia and raised a family there. I never knew the details of why he went, but it sounds suspiciously like "just because he wanted to". Just saying.