to me lip kissing is for adults. My grandfather use to force kiss me on the lips and i would cry.
kissing on lips it for lovers. She is not his lover. I told my husband to tell his mother not to do it as she use to engage is disgusting repetitive kissing games with our 8 month old nephew.
I would go nuts at her if I ever saw her do it to my baby's. Yuck. Wrong! go kiss your husband not a innocent baby.