Where I can found the peace in life.?

I am so upset as my in laws had made my life a hell from the last 8 yrs. Now I came to my parent's home for 15 days and there also they do have their own probs. with my sis. in law (Brother's wife). However she never says me anything but speaks so rudely to my mom which is really not tolerable for me. I am also working so reach home in the evening and spend some time with the kids. I have 2 sons (7 & 5 yrs.). My hubby is at home only with my in laws. My mom in law used to complain him about me for this or that even in front of me and now when I am not at home she must be doing the same. I am not finding peaceful life anywhere if i won't come to my parents home they will feel bad and me also wants some change so came to my parents, what should i do.....