I totally agree. Baby showers are NOT for the dads, asshole. He confronted the host in her home in a loud, aggressive manner - I do not think he was calm at all. I think he said "It's not fair" or something ridiculous and then minutes later said to Elizabeth "Can we go now?" while everyone was still there, trying to have a good time.
I don't think for a second that the other sisters think Andrei is hot and want to sleep with him. They (including Elizabeth) can do much, much better. I see a group of sisters who are very loving and close and are trying to protect Elizabeth (and her unborn baby). Yes, maybe some boundary issues, and a lot of smug. But come on look at how Andrei behaves! If I went to brunch with a BIL and he told me rudely to "Have a seat" I'd dump my mimosa on his head.