My MIL has moved in with my family, and since moving in, we've noticed that she is refusing to wash her hands after using the bathroom. She is leaving feces on things that she is touching. She is living with myself, husband and 4 kids (6-16). They are all disgusted with her lack of washing.
She is currently in the hospital, and we do NOT want to bring her home.
Start by posting a WASH YOUR HANDS!!! sign in the bathroom. Insist she wash them before helping with dinner or before sitting down to eat. The woman is putting others' health at risk, so If she's too grand to practice basic hygiene then there's no place for her in your home.