S.S.
Standard requests are for you to lay down and let them walk all over you, screw up the feeding, sleep, and discipline, then hand they baby back when they're tired of it and ready to go home. Then they request that you smile and say how lovely it was to see them.. blah.. blah.. blah.
Standard responses vary from - um - NO. to ok, to I hate it when the grandparents come to visit and everywhere in between.
I breastfed (past the age of 2, no less), and no one gave my baby a bottle until I changed my mind. People who had a problem with that - well, they can get glad in the same pants they got mad in.
All of my issues came from my side of the family - my husband's family is much more laid back, and learned that guilt tripping me or trying to out fight me - just doesn't work. I'm too dysfunctional to trip, and I stick to my guns longer than crazy glue.
MY family has something to say about everything from the way I discipline my children, the way that I fed /feed them, the way they're dressed, the fact that they ONLY get to see them 3 times a year (I live 800 miles away from my family), blah, blah, blah.
Here's something you might want to work on - especially effective over the phone, but I've used it in person too.
I am the mom in this family. I mean no one any disrespect, and I am sorry if you choose to be offended, but we are doing what is best for us, our child, and our family. (Nothing you have said is unreasonable, btw).
Phone: When you are no longer offended, feel free to give us a call. We love you, bye.
We're at their house: If you truly can not handle that, then maybe it would be best if we go back to our hotel.
They're at our house: We want you to have a close relationship with our child, but until respect the fact that we are raising our child as we see fit, maybe it should be confined to the telephone.
Please note the we. Get your husband on the same page, because he will likely end up having to 'watch your back' for at least a couple of months.