We got those phone calls from the local authorities about the test results yesterday/Thursday, and they couldn't really tell us about any medical details or what will happen. Will get in touch (haha!) with our local doctor on Monday, maybe he has some more info on the test results themselves, or if they could still be in the incubation period, what the next steps will be, etc.
For now anybody infected or anybody who was in direct contact for more than 15 minutes with them is in isolation at home, as per official order by the local authorities.
The 4 relatives of mine mentioned that were CoV-positive do show no symptoms. They are under authority-mandated quarantine "until we tell them otherwise/until revoked", but the authorities can not tell us how to get out of this quarantine.
Some people say that two nevative CoV-test results in a 48h-period are necessary, but getting those tests (would be 8 tests for those 4 people) in an 48h period seems to be impossible.