Here's an example of empathy:
Monday night, my stomach started getting very upset. It was upset yesterday and today, too. Yesterday, my daughter had an upset stomach. Today, my son had to come home from work early with an upset stomach. He was out of work with it yesterday.
We are not giving each other any sort of germs. I didn't even know my son was sick until his girlfriend called me today, and I hadn't seen Rozi since last week until today.
I don't know whether they picked it up from each other, but I guarantee I picked it up from them. This sort of thing happens to me all the time, especially with my kids.