getting our own place

So I posted the other saying that me and my fiancé live my my parents and go to his mums every Friday night til Sunday night, we're getting married in October and have just been mini antes for our own property. I mentioned that my fiancé got upset about me saying once we had our own place I would want to stay at his mums at the weekends as we would have our own home. I mentioned it to him again last night just to have a conversation about it and it turns out the conversation got heated he started going on about how I should grow up and I'm being ridiculous about a married couple sleeping at thier mums house as he doesn't think there's anything wrong with it and all started going on about she's the onlyl family he has. I wouldn't mind but I didn't say we weren't going to see her, I said we could go round on Sunday's but apart tell that's not enough. I'm really upset by how he reacted cos she isn't the only family he has, I'm suppose to be his family two and it's meant to be about us two in the relationship not our families