When is the right time?

Hi everyone so I have a question when is the right time to let your baby sleep over at someone’s house? I’m only asking as my bfs mum is adamant that my child will be sleeping over when it’s a couple weeks old and that they will be buying cribs for the mum and sisters room🥴 I’m sick of trying to explain that we need time with OUR child and I’m a bit scared to let my child sleep over when they have a cat and dog that they let in every bedroom and they let them lay on all the furniture. I said to my bf I wouldn’t feel comfortable till the child is a bit older but they think I’m being nasty I’m not I’m just worried that’s all😕