Am I overreacting???

Its going to be a long post so just bear with me... so we just a beautiful house and moved a week ago. My mother in law was against us buying this house from day one.but even then we did.so there r total 4 bedrooms. Master and another bedroom downstairs and two bedroom upstairs. There is a big second living room and media room upstairs. When we were looking at houses we wanted a double storey home because we knew my husbands parents r going to live us so we wanted separate living space for them so that we all have privacy. When we saw this house i told my husband that if we get this i would like to make the second bedroom thats downstairs to kids room. We have a 3 year old daughter and another one on the way. Then we saw this house many times after that and evertime i told me intension about that downstairs room to my husband. Now we moved here. And he told his mom that if she wants downstairs bedroom we can set that for them. And now yesterday he bombarded another bomb on my head. His niece and nephew are going to come to texas because they got admission here in university and they will stay with us. And they need thwir separate rooms because they r in their like 20 years old.and ofcourse they cant live in one room. So apparently they will have two bedrooms that r upstairs and his parents will have second bedroom thats downstairs. And our kids will sleep with us. And i said what if my family my sis, brother or mom comes visit us, r they gonna stay in hotel? And we had a big fight because when we were looking houses he k ew about all this and he didnt tell me. I said if u had told me before we would have look for a house with 5-6 bedrooms because apparently all your family is going to live with us. And he said his niece and nephew wont live with us forever, ita only for couple of years. I said its years, not days or even months. Its freaking years. How do u think we can manage all this in one place with 2 kids of our own. And i became so angry with him because when i was looking at houses i was looking with my kids in my mind that where they r gonna stay, not his freaking family. He said u r overreacting, its all small things and manageable. Am i really overreacting???

And most of u r gonna think why his niece and nephew cant stay in hostel or get their own place. Well they r moving from another country and they wont have jobs for a while and also our family is kind of traditional and conservative, i dont know how to explain this. But anyways even then its not my problem where they stay.

I feel like my blood pressure is rising from all this tension. Which i should not get because im 4 months pregnant but he doesnt care what i feel . He only cares about his parents. He doesn’t understand that he is a parent too and he has a responsibility.

Tell me if im actually overreacting!!!