COVID

Hey guys. So my uncle and aunt are fully vaccinated and live in Oregon. They want to come visit us in SD in may. Me and my family are fully vaccinated too. However my dad is very high risk and is on immunosuppressants. The Drs don’t think the vaccine is very effective for people who are on immunosuppressants as of now.

Could my uncle coming down to SD on a plane be a risk to my dad even tho my uncle and aunt are fully vaccinated?