My sil (my dh's sister) and her dh are having marital problems after being married 1 1/2 yrs, no children, financially well off, etc. To help, her mother, my mil, went and stayed with them. Wtf. I told my dh, if we are having problems and you invite your mother to stay with us to "help", consider yourself divorced. Seriously. His mom needs to butt out and his sister needs to grow the eff up.