We are not citizens of country we are living in right now, my father is working here so he can act as a custodian for us to continue living here. His condition isn't good at the moment with ckd

He told me to try to marry a local girl so when he's away his company of 20+ years could still operate here without giving away and my mother could still live here when he passed away.

He hinted me to go back to my ex who's a citizen here.

What should I do?