But there is also a financial implication here - I didn't get from the OP's post that the reason for an overnight stay was because of her health; rather, that it was because of the distance. So - a night away in a hotel, a long drive, faffing at the airport (plus buying expensive food/drinks etc), hefty parking charges even for a short stay? It starts becoming not terribly cheap, and not all airport hotels (if that's where he will have to stay) have free transfers, either. That's not a cheap proposition!
One of my brothers went away with a couple of friends for some considerable time: the boys who lived further away stayed at my parents before - it made sense, because they are close to the airport. The one from London made his own way on the Tube. My parents took them to the airport, filled them up from Garfunkels or wherever, and saw them off - it wouldn't have made financial sense, or, in fact, any sense, for the two who lived miles away for their parents to bring them, pay out for petrol, pay out for a hotel etc etc just to wave them goodbye.
When you're flying, you need to be able to check in, get sorted out, and go through security etc without being in a flap or upset. Having another person about is only useful in poxy airports Manchester, I'm looking at you where the loo cubicles aren't big enough to fit your luggage trolley in. Otherwise, it's just one more thing to worry about.