That's fair, a whole bunch has been thrown at you at once.
So there are multiple dimensions, I guess? The multiverse exists, basically. And we're kind of in an alternate of the one you and I are from. And there's also a few others. "Our" Kate is from ours, she's my dad's friend and he brought her home to meet us at Christmas. Lucky is the dog she rescued. But in another dimension, my dad exists but isn't my dad. He's not anyone's dad and he's apparently not great at commitment but he's been doing really well here so he and Mr. Klaus are getting married. That's not!Dad, but I usually just call him Clint. And he ALSO has a Kate and she just showed up and she's Kate 2. And he brought his version of Lucky so we have two of them, too. And SHE brought her baby landshark, his name is Jeff and he's got a naughty streak but he's cute so he gets away with it.