Cath does kinda have a point. Unpalatable though it may be, emergency leave is intended for situations where there is no alternative. If a parent is with the child already, one more would be nice, but it's not essential.
If childcare is needed for other children not in hospital, that's different, but that is not apparently the case here.
HOWEVER...Any decent boss would allow the other parent to go off in these circumstances, certainly for the first admission, and I think the way this manager has handled this situation is unforgivable.
I would strongly urge the H to look for a new job asap because he will potentially need understanding in the future. If he can make the effort to go above and beyond for an organisation that will match that by being compassionate, then this is a mututally beneficial arrangement. The current boss' attitude will just breed resentment.
I spent 10 days in hospital with my DS a few years ago. I'm the only parent about to be there. I had to take half unpaid, and the company gave me the other half as a gesture of support, I was SO broke at the end of it all, but knowing that whatever I needed to do, I could do was most welcome. As a result, I'd never want to abuse that. I really appreciated their response. I still do. It made an awful situation just that little bit less stressful.