why don't they call to see how we are?

My husband and I have had covid. Not seriously, for the tiredness and brain fog are going on and on.
Normally we have an active life, with plenty going on, and this has all been stripped away.
The thing is, none of our children have called us this week to see how we are, which I find upsetting. And I'm not sure how to address it.
I suppose it's partly because I've been determined not to follow my mother's demanding style of parenting. So I'm calling my mum every day, and I don't hear a thing from my children. Which doesn't seem fair.