I've had this conversation tonight.
Family member has to travel to take elderly family member to critical medical appointment - fine.
Grandma is therefore coming over to look after their child, so child doesn't have to go with - would be fine except....
Childs dad is working from home!
Cue: he can't hear child due to headset, its unprofessional if child cries etc etc....
No grasp that dad could just NOT work (they can afford it and he's so very definitely not a keyworker!) for a few hours and look after his own kid. No grasp that granny (in her 50's and gets on well with elderly relative) could be the one to escort elderly relative, thus mixing only two households instead of three. Nope, its all okay because 'granny is providing essential care'.
These are bright, educated people and I was banging my head against a brick wall of 'yeah, but....'
And, I've got to be honest, I think part of it, for them and probably many others, is that they're so used to other people shouldering part of their parenting load that they genuinely can't contemplate managing without it. Just the idea that they, and ONLY they, are expected to get on with it now is triggering panic and so all the 'yeah, yeah but, but....'