So frustrated with my child care

I work full time and my mom is my babysitter, and cares for my LO at her house. She loves my LO, and I know she takes amazing care of him. The problem is that she has a lot of friends/family that constantly drop into her home, and a lot of them bring little ones along. Because of the constant traffic in her home, my son is on his 5th cold!!! Tonight I really feel like crying it’s just not fair!!!

Last week when I picked my son up, one of my cousins was randomly visiting my mom, and her 1 y/o had a runny nose, my gut instinct knew my son would get it and sure enough! About 2 months ago another cousins baby had roseola, and a couple weeks later my son got it. I’m so tired of it! Today, my dad clearly had a cold and he was holding my son! I could just cry! My parents are super old school and don’t understand that babies don’t get sick from the cold air, or touching the cold floor, but that it’s viruses. I love my parents so much and want my son to have a good relationship with them, but I’m getting to the point where I feel like I may need to find a different child care arrangement, even though it would break my parents heart. Idk if I’m overreacting or not 😩😭