You and Simon married years ago and had a kid/teen together.

You always knew that Simon was..Not fully human at all, but your kid didn't. They thought their dad was just..Unusual the way he smelt like blood sometimes. Until..One time, your kid woke up in the middle of the night and felt thirsty. They went downstairs to grab a cup and saw..Simon teleporting (?) from the couch to the kitchen to grab a drink & a cigar..The kid immediately ran to your room and called you.

"Mom, wake up..Mom?."