Covid-conscious parents of children under 2, are we supposed to avoid unvaccinated family members?

Abby

We are in a high transmission, low vaccinated area. Most of our family members are vaccinated except for one. He does not wear a mask either and my little one is too young to. Should we be avoiding him in indoor settings amid the rise of the delta surge?

I feel that I should also add that he declined the vaccine for non-medical reasons.

Please, no political responses. Just wondering if anyone has a reference to some research because I'm having trouble finding the answers myself.