My DIL is 4 days overdue and has asked to stay at ours for another week. This is no problem to us as DS is back to work tomorrow and I'll be around. It makes sense as she won't be alone if she goes into labour. I'm a bit uncomfortable though with being called "mum" in the last few days by her. I really do adore her, but, well, she has a mum doesn't she? She doesn't have a great relationship with her own mum. I wondered do any ladies call their MIL "mum"?