hey EllyBoo72,
Just tell them how its going to be... I know its a bit harder than it sounds but I had to do the same thing with my MIL.. Everything I did was not quiet right in her book ect ect blah blah... but in the end i just had to say "I am doing this my way and if you want to be involved please just back off" ........ I didnt say it exactly like that but she got the picture... now she is really good.. she asks me if she can hold him, feed him ect and asks if she can look after him.

We are the mums now... Once, we were part of thier family unit when we didnt have kids.... but now they are part of our family unit and they have to respect that weather they like it or not!!

Good luck with it mate... and just be prepared to be the bad guy for a while.. if she is a decent woman she will respect you more once she gets over herself

xox