Dominic

Dominic is the son of Mia in an alternate future, but that never ends up having in the normal timeline, since he traveled back in time long before his parents even met in his own alternative timeline.

Reason he traveled was, so he can stop the events that would lead up to his parents death not long after he was born. He never learned what his parents looked, or even his mother's name, only learning his fathers name during his time living in a orphanage.

Thanks to his (temporary) amnesia he got while travelling back, he can't stop the accident that many years later ends up killing his father (his father gets wounded with a curse spell, though no one knew that until his father is close to dying), after some time, he evantually ends up in a relationship with Mia, with them even having sex before his memories are anywhere close to return. Him staying in the normal timeline made it so he is never born in this timeline (as his parents never meet, because Mia is with him at the time she should meet his father), though since he is from an alternative timeline, he doesn't disappear after the time he should have been born happens.

After he memories come back and everything is revealed, it takes a long, long time, but after many tears and difficult times, he and Mia end up together briefly, which time they even have children together (Sandy being the oldest of them), but in the end they go their separate ways.