Flower she is very lucky to have a MIL like you who can understand that you need to give them plenty of space and time to themselve's,your son sounds delightful and caperable as a dad so she will have his reassurance also in the first few days,I would speak with your DS about her maybe being sad as to her mum not being around and tell him you are available when ever she feels she needs any help,then stand back and enjoy your new arrival 
This weather is getting me down. Is it May or March?
