Yeah it's annoying having to live with others. thankgoodness I moved out of my parents house and live with my partner now. I take care of my baby by myself cause I don't trust others. lol. Also I have two different types of cloths (one for bum and one for face). But no one ever listens to me when I say which cloth is which.
I used to let my mother in law babysit my boy for 2-3hours a week and they always mix up the cloth (use bum cloth for face and face cloth for bum) So in the end I just bring a face cloth and don't bother bringing the diaper bag so they won't need to change his diaper thus won't mix up the cloths.
If your mother in-law insist on wiping the baby's face, I'd get the face cloth ready before the baby finish eating so when the time comes all you have to do is present the cloth (ta-dah) and your mother in law don't need to get the kitchen cloth. :-)