Touching your baby’s hand

Hi Mummies, what will you do if your in-laws & family in-laws keep touching your baby’s hand and smelling your baby head or where with their nose? (Especially my baby’s godma which is my sis-in-laws) (Not sure if they have kiss or not) As my baby like to eat her hand frequently, i kept wipe and wash baby’s hand hundred of time because of them. Had felt super uncomfortable but not dare to say much as i had told them alot times but they still repeated it sometimes if I’m not give them a reminder ? And they hadn’t wash their hand sometimes when back home ? I’m very worrying now as now have Wuhan virus outside.