Partner's overbearing family

My boyfriend and I have been together for over four years now. We have just very recently moved overseas to resettle and travel. We have been in our new country less than a month and only a couple of days ago my boyfriend has informed me that his mother may be arriving very shortly to find work and live in our new city. Which leads me to believe that his father will follow in due time. My re action was to be very upset and angry. In our last month in our previous country was spent living with them to help us save on rent as my parents live to far away to be convenient. I am very thankful to them for allowing this but I was also very excited at the prospect of my partner and I going on a new adventure together alone. For a bit of back story my partner and I come from completely different cultural backgrounds. I am from New Zealand and my boyfriend born in the Philippines and immigrated when he was twelve. I understand that in fillipino culture it is normal for families to be very involved in one another's lives and is not unusual for grandparents to remain living with their children. Back when we where still in NZ every weekend my partner would visit them and sometimes also in the evenings for dinner. Often our nights were and still are interrupted by numerous phone calls or (when still in NZ) requests that he pick up or drop off something. Very full on. At first I was annoyed allot and we discussed boundaries and it was OK for a while as I would only occasionally accompany him. The month before we left was hard for me as I now feel a little in debt to them for letting us stay and lending my partner money to help us get on our feet. One of the reasons I was so looking forward to moving country was having no one to answer to and no obligations apart from work commitments and each other. I feel I have grown and learned to accept the cultural differences as part of my partner that shouldn't have to change. But they are often times quite different from my own and my own families dynamics. So I am unsure of how to deal with the possibility of his mother moving and maybe the rest of his family. My partner doesn't understand my frustration and has this complex of owing them for bringing him to live in NZ and raising him so on and so forth which I find baffling. He also become very angry. I am at a loss with how to proceed or how to keep myself composed if his mother does move.