Welcome back SchrodingersKitty. 22 days is a long haul - I'm glad you're feeling better. I hope your husband has some answers from the MRI.
I have two college students and two high schoolers at home. I'm not setting them many tasks, but a few days ago I did ask them all to clean a bathroom each and hoover one floor of the house each. They don't cook, but they do all clean up after dinner.
We did make a conscious decision that we didn't want the children to feel punished by having to be at home when otherwise they'd be doing all the things they love - sports, drama, singing, clubs, socialising etc. So we've tried not to give them more chores than they usually would get, if you see what I mean.
DD is on her third week off college, and starts online learning next week. She's taking one extra class this term, so I expect her to work pretty hard once they're up and running. She's also taught herself Python while she's off, but other than that she's mostly relaxed and walked the dog.
Her boyfriend has been back to online college learning for nearly 2 weeks and is working incredibly hard - he's doing extra classes.
My high schoolers have had online classes most days with a set schedule between 9am and 3pm - they do get breaks in that time but they also have homework to do. So they're pretty busy.
It's interesting how everyone seems to be doing more exercise rather than less. All but one have taken up running, they're using our rowing machine, and everyone's walking the dog. Poor guy :-)