Call your parents. Tell them they need to take this seriously, because they are the ones most likely to die from this virus.
Tell them that while average mortality rates may be low, it is highly dependend on age. Dr. Drosten of Charité in Berlin estimates mortality from corona in people aged >80 to be around 25%.
Tell them that exponential growth always looks harmless at first but that this exponential growth is also what makes atomic bombs explode.
Tell them that dying from Corona means dying alone.
The last point finally convinced them to stay at home.