Living situation

I’m stuck so I’m getting married soon. My fiancée and I are saving up for a home the market is so bad and super expensive to buy a home here in California. So we are saving up until the market goes down. Regardless he has a son. Our parents both offered us to stay. However he has a son. He hardly has room for me to live with him. I have a bigger room with more space I feel more comfortable living at my home. Which they welcomed his son with open hands. Not just that we have a small guest house we currently use for storage. We can rent out a storage room for my parents and actually use the guest home. He said doesn’t want to live here due to his son. The way he worded it was I don’t want to bring my son at someone else home. Which isn’t just someone else home it’s my home. I really don’t want to live at his house. Since parents are extremely strict with certain things I’m not use to. They butt in into our business while my parents tell us your adult you make your own choices im not going to tell you what to do. He has 2 dogs already and I have a furry ball his parents made it clear they don’t want another dog coming in this house. His dad is somewhat cranky for anything sometimes for no reason which makes me uncomfortable. I literally have no space for my things not even my clothes his room is so cluttered and tiny. I don’t even know what to do. I don’t want to live in a stress place especially with going to school and working. I don’t even know what to do. This sounds childish but I’m so confused