I don't want to feed my baby sugar, he is 4 months old

My in laws are always trying to defy me and make me mad by giving my son things that i don't want to give him. It makes me so angry, i hate that they don't ask or respect my wants for my Child. I tell my husband but he gets mad, he makes me feel so petty and i hate feeling like i can't speak out because im afraid they'll get butt hurt since they take everything up the ass. I say this because i've told them before about not kissing the babies hands or mouth and they tottaly flipped, so did my husband he told me i had to apologize. I didn't because i was just trying to take care of my baby's health.

Keep in mind that we live with them thats why i feel like i can't say anything, just to live in peace.. i hate this