Apparently, Jason hadn't been erased from existence when Erika wished her stepmother (Sharon) was more like her real mother. Her "former" stepmother had married some other guy and had Jason with him instead.
In this new reality, Jason was now the son of Sharon and Henry Johnson, who was a young lawyer. Sharon hadn't married a man older than her, but one who was roughly the same age.
It meant that her father was still out there dating, probably. She didn't see any evidence to the contrary. But...he could choose wrong again.
