The Baby Sitters Club/WMG

All the babysitters are Haruhi-like gods.
And all of Stoneybrook is in on it, hence why they tend to let their lives revolve around the club, and indulge them in their beliefs, such as the girls believing they're still thirteen, even though years passed and they physically aged. (Seriously, some of those covers? They look sixteen, seventeen.)
 * Which is funny because Karen is an Eldritch Abomination, and everyone, including the babysitters, keep her happy so she doesn't destroy Stoneybrook.

Patrick Thomas is not David Michael's biological father.
Patrick left right after David Michael was born. While Charlie, Sam, and Kristy are all relatively close in age, David Michael was a bit of a latecomer. Finally, David Michael didn't get an invite to Patrick's wedding in the Friends Forever spin-off, while his siblings did.
 * One fanfic suggested that Richard Spier fathered David Michael.