Iam very lucky in this matter Masha Allah. My in laws are pretty peaceful, infact I am of the opinion that it is up to the husband to define a limit, across which no one is allowed to interfere in personal matters. He does not discuss personal issues of ours with any one and I have not ever noticed any behaviour change when his or my family are around.
not much different.. infact.. more romantic (if its even possible) infront of his folks which i found a bit weird at first but since his family is cool with it.. and dont badmouth bout it .. its all good... my in laws are mashallah very laid back and cool ppl to be around so the husband doesnt feel the need to hide his emotions towards me .. the support, love, care, discussions are always the same infront of parents as they are behind closed doors.