It was a fullcolor webcomic. One of the main characters was a man, his grandfather showed him a photo of his younger self with some woman. Grandfather thinks this woman is still young because she is a witch. Soo the dude finds this woman and she is indeed still young. She is raising two children. The boy is a vampire (maybe?) and the girl is a witch. All three decide to shove the dude in their basement so he won't tell their secret to anyone. They can't decide what to do with him so they just keep him there. From time to time the little girl goes down there to talk with the dude. Can't remember much else.
The visual style was something like this: