Who do you allow to give your toddler kisses on the mouth?

Question

My husband and I have an 18 month old daughter. We have previously discussed and agreed that we only want for he and I to kiss our daughter on the mouth. No grand parents, extended family, friends, etc. Tonight when my daughter and I were leaving his grandparents house, both grandma and grandpa came over and kissed my daughter on the mouth. My husband and I decided that he would tell his family that kisses are for cheeks, and I would tell my family the same, concerning our daughter. We just don’t like the idea of spreading germs. And also, I don’t want for his family to kiss my daughters mouth, and then I kiss her good night right afterwards, and my husband the same towards my family. I’m not mad at my husband by any means for not already setting boundaries with his family, because he hardly ever sees them because of his work schedule. I just feel uncomfortable that they kissed my daughter on the mouth without mine or my husbands consent. 
P.S. my husband told me that his grand parents never kissed him or his brother or their little cousin who is a girl, when they were toddlers or young children. Likewise, my brother and I never kissed our grand parents on the mouth growing up. 
What do y’all think? Is it normal for grandparents to kiss grandchildren on the mouth? Am I the odd one out here? Who do you allow to kiss your child on the mouth?

Answer

I let my child choose. Who to kiss, and how they will recieve said kiss. 
Ive always felt that babies and toddlers should be able to say yes or no to kisses on the mouth. As his mom, i didn't kiss his mouth and I let every one know that they needed his yes or no to a kiss. At 18 months, he chose to kiss me and my husband on the mouth and blow kisses to everyone else. Around 2 he started giving his aunties and most of his grandparents kisses on the mouth or on their cheeks if he was feeling gracious. But usually mouth kisses were saved for mommy.   I feel like my toddler should have say over how his body is treated. They have so little say in whats best for them so I give him this one.