Tell me if this is wrong! ( warning it's long)

My husband and I have been together for over 4 years and have a son together who was born June 1st of this year. My husband has another daughter who is now 11 years old and lives across the country in a different state. Here's a little background info: Him and his ex had their daughter when they were young (22ish) and we're not even together when she was born. They have always had a horrible relationship and I will be the first to admit that it goes both ways. And I'll add that she HATES me. I honestly have no idea why...I've never seen or spoken to her since she lives far away. Even to this day I don't think they have ever had a conversation that didn't end up in a fight. Anyways, his ex packed up and moved with his daughter about 7 years ago and so far has only been able to see her twice since then. She refuses to send her out here even when my husband offers to pay, he even offered to fly his ex out here if that meant his daughter would come to. He pays his child support every month with no questions asked and pays for anything his ex or daughter asks for (braces,toys, etc). Ok fast forward a few years to now! They FINALLY agreed to come out here. He was stoked to see his daughter! His family was excited too since they also don't get to see her and rarely talk to her. Well our son came early at 28 weeks so everything got a little hectic for all of us. Anyways, when her told her our son was born she decided to "cancel" their trip because she was mad. Mad because we had a baby? Idk. He hadn't talked to his daughter in a few weeks because she wouldn't answer on her own phone and his ex wouldn't answer for him on hers either. Well....finally last night he got a text saying that his daughter doesn't have her phone with her...blah blah. Not only thAt...but that they had been in town for 2 weeks now but are leaving tomorrow!!!! Not only that but the only way he would get to see his daughter is if he missed work today to drive to a neighboring state because that's where they are heading today. WHAT IN THE ACTUAL FUCK. He was so upset...and to top it off she said "well truthfully she just didn't want to see you so I didn't make her" ummmmmm. This seriously breaks my heart...not only for him but for his daughter too! Who knows what kind of crazy things she tells her at this point...since she clearly has something wrong with her!

My dad passed when I was 7 and I've never understood why someone would purposely keep their dad away from them.

He didn't sleep all night 😭 what can I do to try and help him? What can I say...?

Oh and he's never gotten a paternity test even though no one thinks she looks like him but honestly he's already accepted her as his daughter so he won't do it.