Is there a seal in the house

At night, I swear you would think there were seals in my kid's bedroom. It started with Jared on Saturday night, I ended up taking him to urgent care on Sunday afternoon and found out that not only does he have croup, but he has strep throat as well. After one day of having the cool mist humidifier in his room, Allison started, so the humidifier has been moved. You would think that the 1 year old would have gotten the croup, but no,it is my almost 8 year old and 6 year old( go figure). Hopefully Spring is fast approaching and we will be over this stuff soon, one can only hope.