I've often thought that in some ways, it's probably harder to be the family of a chemo patient than to be the one with the cancer. I know I'd find it harder, if the roles were reversed.
Parents often looked as tired as the patients, and usually more stressed - but they would stay however long the treatments took. Kids rarely came in without family members to keep them company. I think it's probably a frequent entreaty of young people in hospitals; "You can go back to the hotel and get a few hours sleep if you need, I'll be fine here."
But I've never seen any parent actually do so. I think this picture captures the dynamic much more than I can with words.