moving out of Bo’s. I believe she told him she was going to the Salem Inn and he suggested she come stay at his place since he had lots of room and Cierra would have a huge yard to play in. Plus, he could keep them safe there. She agreed. He then went back to Bo (later) and yelled at him for letting his wife and child leave.
As to Vivian, I believe she sucked up to him at a time when he liked having attention. Then, she asked and he agreed. I think he did it more for the entertainment that she caused by annoying Kate and going against Carly. Personally, I think Victor is having some memory issues, he’s forgotten what she can be like, lol.
I don’t believe that Daniel and Carly know the Victor connection yet. They knew each other from conventions and work.