It's possible your kids picked up something at school or daycare. Kids are a mess when it comes to germs.I've gone a couple weeks mostly not wearing a mask so far (I did for an interview today since it was for a healthcare related job, speaking of which, more on that later) and now as of yesterday I have a sore throat. Very frustrated about that.
When I complained about that, my dad teased me and said, "should've worn a mask". But man, idk. It could be allergies or I could have gotten something from visiting with my grandma or kids.