Feeling frustrated

Feeling frustrated and I probably shouldn’t be. My 3yo is an only child. My sil has 2 kids 4 & 3. Every time my daughter goes over, she gets sick. It feels like it’s every other week that she’s getting sick. We don’t get a warning on if the kids are sick. My husband and I work and my mil watches our daughter once out of the week. The kids are there every other week and every time they’re there, my daughter gets sick a day or two later. My sil always makes plans with us for activities to do with the kids and doesn’t tell us if the kids are sick. My brother’s kid’s mother ALWAYS text me before they come if they’re sick and will ask me if I’m comfortable with them coming. I’m not sure why that same courtesy isn’t extended from my sil or mil.

And yes, I know. Kids get sick. But my daughter isn’t in school so as of right now it’s very rare for her to be sick and we’d like to keep it that way. Is it unreasonable for us to not want to bring our daughter around them WHEN they’re sick? Ofc they’ll still see each other but only when no one is sick. With Covid, I personally don’t feel like this is unreasonable. This is the third time I’ve had to call out in 2 months because my toddler is sick and I’m almost positive I might be let go because of it.