NannaAngel There is more to the WHO figures than meets the eye, and having read some of the scientific studies, the chances of you picking the disease up by contact is vanishingly small.
To begin with, you cannot get COVID from just one viral cell of COVID. Everyone's immune system can deal with an odd cell. if we did not have that capacity, the human race wouldn't have lasted long enough to develop.
You will have seen the phrase 'viral load' a lot since COVID. It means that you need to inhale a goodly load of viral cells to be infected.
COVID cells, like us, age. If someone breathes a load of fresh cells on you, you may well get COVID, but once that load of cells lands on a surface it starts to age and die, and while a few cells will stay on a surface for several days, their ability to multiply or transfer the disease, drops from the moment they land on the surface.
The WHO figures are based on lab-based conditions. I read a paper on this. Scientific experiments are done under very strict conditions that do not appertain to real life. The surfaces they use will be clinically clean, once contaminated with virus, the surfaces are kept in a sealed, cconditioned container. The scientists themselves, in their report expressed doubt as to whether their experiments would stand-up to real world conditions - and again, the fact that the viral cells 3 days, or whatever, doesn't mean they were capable of infecting anyone, after an hour or so, because they would be aging and dying.
If you want your family to wash their hands, just say so the moment they come in the door. 'Lovely to see you, now, all of you, off and wash your hands'.