twilight. vampire dairy. doctor who. supernatural. buffy the vampire slayer. game of thrones. tangled. pretty little liars. All of these have age differences.
it isn't even a son/mother relationships, she isn't treating him like a love interest while he is a kid, she is a witch who doesn't age like a human.
Being a bitch can't be cure, but jealousy is a disease so.... take a nap and get better