"Don't come in, dad!!!" (Page 4)
Same way, probably. Like father like son!Where did dad get it from?
Realistically, if it can be spread via kisses, the virus is present in the saliva, so there are other ways of spreading it besides kissing. The most likely vector is food, i.e. the father's cooking dinner and he gives it a taste-test to see if it's seasoned properly, unwittingly contaminating the food in the process.I get the feeling that any kiss like to the cheek or the forehead is probably how it spreads and how the dad gave it to the son, but it's funnier to think it wasn't a kiss to the forehead.