Quarantine/Isolation

Almost 2 weeks of quarantine/isolation for my family after a couple of positive Covid tests for Guni and Wanda. Most important thing is that they experienced almost no symptoms.
Peter and his family where here for a visit when it happened, and they isolated from us in another part of the house.
Strange situation, but we managed it.
I wonder about the reliability and the sense of these tests at the current stage of the pandemic.