Interferring Mother in Laws?

I have a 21wk old daughter and everytime i go to my mil they always try and tell me how to look after her and think they know whats wrong when she crys and what she likes but they dont have a clue, also my sister in law who lives at my mil's has a daughter 11wks older than mine and all they do is compare them which does my head in and then theres my husbands 8yr old brither who just pesters my baby all the time wanting to hold her and if i say no he starts shouting his mouth off saying he's her uncle...i didnt mind taking her to the house when she was 1st born but now its getting worse and try my best not to go and i dont want them in my life...another thing they dont listen to what i say so if i said dont give her something they would thats why il never leave her alone with them ever...does anyone else have this prob and any solutuons....