He doesn't sound like a very nice man, OP. You need support from your partner in a situation like that. I've had both my parents at one time or other be rushed into hospital and DH has dropped everything to look after our kids himself so that I could do what needed to be done at the hospital, and he has texted or phoned to ask for news etc. They weren't HIS parents and Im' sure he doesn't love them like he loves his own but he did exactly the right thing and he stepped up to support me. Your partner didn't.
I do think SOME men (who are a tad on the cold unemotional side, a bit like my DH can be on occasion, and definitely DS1 who is 17 and barely aware of what anyone else is up to
) just don't think about things like providing emotional support. They think "no news is good news" and often don't see the need to phone for updates as they think you'll let THEM know if there's anything they need to know.
But even if he's crap at the emotional support he should still have offered the practical support, shouldn't he? Like gone and collected the kids from your sister's. Offered to take over from you at the hospital, or to take you something to eat etc.
It's weird behaviour from him all round. If he was so concerned about his brother, did he not text you to tell you about that, even, when he found out? If he had texted you immediately he found out about that that would have been the opportunity to ask for an update on your DD.
Is he regularly so uncommunicative about important family events?
Does your DD have her biological dad in her life? Just wondering if he was also at the hospital, in which case did your partner thought he wasn't needed there, or that he was treading on her dad's toes?
It's just bizarre, I can't fathom that behaviour at all.
I hope your DD makes a full recovery, OP, and that things drastically improve in terms of your relationship with your partner.