Eudaimonia

Harry travels back in time to save Merope Gaunt from dying. He takes her in, heals her illness, helps her when she gives birth to her son... and then falls prey to her love potion.

Tom grows up with mother and father both, in a household that might generously be called a happy one. When Merope insists that Tom not attend Hogwarts, Harry reluctantly agrees to homeschool their son himself.

Despite his lack of exposure to the outside world, it doesn't take Tom long to realize something is off about his parents' marriage.

It takes even less time for him to decide his loving father deserves better.