Help I miss my family

I am vaccinated but my kids ages 8 and 4 aren’t. My brother has a daughter who’s 5 and my kids haven’t seen her since March 2020

My brother nor his daughter are vaccinated. He sends her to public school and sports events and she’s out in public a lot more than we are. I’m way more cautious about the virus. My kids are virtual school I was wondering if y’all think I should let her start coming over and spending the night and spending time with the kids again

I’m just worried about my kids contracting the virus. They have asthma