Please Help me? I need to calm down in my head, i am very stressed?

My husband and i married 6 months ago. I am 5 months pregnant and after ups and downs in new relationship, we have finally understood each other and are happy. My widowed F-I-L claims that he is ecstatic about having his grandchild and so he came to visit us and spend couple of weeks. He asked my husband to buy his ticket, my husband and i are going back to where his family is for a weekend in 2 weeks so my husband booked his return ticket as well. But now it seems like he has plans to permanently stay with us. First of all, my and my husband lives in one bedroom apartment and don't want to move to another apartment as we are moving to texas in 6 months. So FIL is spread in the living room. I am disturbed with this living situation on permanent basis and especially when my baby comes, its going to be crowded. I have also asked my mom to come stay with me for few weeks to help me recover and with my baby. Now i dont want him to stay here and will never want my mom and him in one house