Hi 22ann
I sympathise with you, I find my ILs a bit much too - although they are not as overbearing as yours. But my SIL (DH brothers wife) has my MIL round everyday and she just wants to sit with baby on her lap and complains of a bad back if asked to change nappies - iron etc, so I feel really sorry for SIL. Luckily we live about 2 hours away so like you it's about a 3 weekly visit to us.
That said when my DD was born and was 1st GC they came within 24 hours of me giving birth and I ended up cooking the dinner - having not 24 hours before been in labour while they fussed uddled and coo'ed over her in the lounge!
MY DD went back in to hospital a week after her birth with feeding problems (long story). But basically the night she came home (spent 4 days in SCBU)there they were again and there I was again in the kitchen!!
My SIL has since had 2 DD's and is currently the focus of the majority of thier attention. However my 2nd DC is on the way in December, and if it's a boy it will be their first and only GS and I am trying to anticipate how thier attitude will change.
With regards to feeding, we never let anyone else feed DD as we wanted her to be in a routine due to her intital problems and DH and I have already agree apart from me and him and now DD once again no one will feed next baby.
I dont know about you but I can't bring myself to tell MIL and FIl what annoys me about them (as there is mcuh more than I have mentioned here). My SIL does and she still gets daily visits.
So now I just put up with them, or put barriers in their way for certain things so they can't have thier own way. I am very close to another female member of DH's family and I vent all my frustration to her as she knows what they're like. Or I come on MN or complain to friends with equally anoying MIL's.