I have a 4 month old niece & mother in law pops by regularly to play with her. When the baby was sleeping, she will also use the pacifier to "disturb" her by rubbing it on the lips and keep shaking the cot & calling her to wake her up.
During CNY, when we were preparing the yu-sheng, she dipped her finger in the plum sauce and put it in the baby's mouth. The baby started to frown and mother in law thought it was so funny so she did it again & again. I was shocked and i think it is really unhygienic to do that...
She also fed the baby packet chrysanthemum tea and because it is sweet, my niece will want more & mother in law seemed to enjoy it when the baby kept seeking her attention so she kept feeding her!
Once, she was playing with my niece and she told her, "next time when my grand-daughter is out, i dont't want you already!"
I believe mother in law will also pop down as and when esp after my baby is born as she lives near us. BTW, mother in law also told me not to feed my baby breastmilk, better to drink FM so easier for anyone to feed. I think she just wants to reduce the bonding time i have with my baby.