Philzas kids have been through alot and he has aswell. They have fought and died against one another and together. The once strong family bond seemed to barley tie them to one another. But not anymore, Philza has looked at their relationship and the place that tore them apart and has forced all his kids away from the dsmp.

Philza wouldn't let this opportunity for new beginnings go to waste. He will do things right this time and they will be a family no matter how fucked up they now are and no matter how possessive or obsessive things get as they rekindle family bonds and the need to protect and another from the outside world.

Philza will keep his children safe this time, he's determined and theirs nothing that can stop him.

That's basically how you ended up thousands of miles from the dsmp with your suddenly protective and possessive father and 3 brothers.