Catching up tons as I was off having babies of my own...
yes, did the surrogate mum breast feed them even once, or is that not a thing? tbf I've just delivered twins, I have no milk, partly cos twins tend to come early. It's entirely possible she couldn't anyway.
I certainly didn't try to change a 2 week old baby in a cot and use foul language. but that has nothing to do with it being two dads. Lots of people swear around their pre verbal children, lots of new parents would think changing a baby where its lying comfortable is fine cos what's the worst thst could happen...