WAITING

 I don't know for certain, but I imagine this family may be some of the foreigners who came to Serbia recently to do a bit of 'quarantourism'.  Most were/are Indian nationals who cannot fly directly to their destinations from India. Most of those have jobs in the Middle East, whereas others want to visit families in the US, Canada, or elsewhere.  They stay here ten days (tested, of course), then are tested again and move on.