Yesterday I said I would take out my DP's Grandmother to Costco. I told her that DS (6 months) has a tooth coming through. We were queuing to pay and she took it upon herself (after touching everything in the shop and goodness knows what else beforehand) to the put her fingers in his mouth to feel the tooth. She did it multiple times. DS was quite unsettled last night and has a runny nose- maybe a cold, maybe his teeth? Today she has called me to help her with a letter she has received. I've come round and now she is kissing DS all over his face and has told me that I shouldn't be bathing him at my parents (which I do once a week in the eves as they look after him whilst I'm at work, by the time we get home it's too late and it works for us) as that's what's caused him to be unwell- taking him out in the cold! I hardly stick him in the car seat dripping wet!! She's really irritating me as I think there's more of a chance of him getting unwell due to what she's done the past couple of days- not me bathing him at my parents house! AIBU?