Would you be upset?

I have a 1 year old daughter. My family lives close by and my mom planned for us to come over and swim and BBQ on the 4th of July. My sister has a 17 month old and a 3 year old, and she got sick with a bad cold the week leading up to it. Her kids also got sick. When the 4th came, my sister stayed home with her youngest and sent her 3 year old to my parents house because he wanted to swim. I told them all that if he is still sick, we don't want to come because I don't want us to get sick. Both my mom and my sister told me that he's not sick anymore, that he's totally fine. That I'd be overreacting if we didn't come. We went and he was sneezing, coughing, and snotting all over the place (very obviously still quite sick). We didn't stay long, but now my entire family (including my 1 year old) is sick. For the record, it's just a cold - my sister tested for covid and it was negative. I told my mom we are now all sick because we came over and she tried to tell me that it's not from that, it's from allergies, so I just stopped talking to her about it.

I get that sickness happens. We'll get over it. What I'm upset about is that both my mom and my sister straight up lied to me to get us to come over, resulting in my daughter getting sick. I feel like they put the happiness of my 3 year old nephew over the health of my 1 year old daughter and I'm pissed about it. Would this upset you?

For the record, we left after we ate (my mom put food down in front of us right as we got there) and I don't have a problem with my nephew being there, just that we were told he was well when he wasn't.