They had met. Dawn was completely a part of Buffy's childhood. Also, my dad paid child support to my mom and barely saw me. Now he has nothing whatsoever to do with me. It would have been nice if he could have been there emotionally as well. Just because you pay money, doesn't make you a parent.
Those memories were fake.
The universe was altered to give hank a new baby.
The universe was altered to take away Angel's first born.