I'm a follower of alternate (or "counter-factual") history and Judith is featured in at least one alternate timeline set in the 1980s. In that timeline, Family Ties is struggling in the ratings by 1985 because of a different timeslot to our world. In a gamble to save the show, producers (via a series of Very Special Episodes) have Elyse's pregnancy miscarry and the Keatons instead adopt a little girl played by Judith Barsi.

A thing that puzzles me about Josef's actions is that he waited two full days between killing Judith and Maria and killing himself - a few hours after the murders he even actively concealed them when Judith's agent called wondering why Judith hadn't turned up to an audition at Hanna-Barbera

Both mother and father sides of Judith's relatives in Hungary pretty much disowned her and Maria after the murders (and many would say, even before) - for a start, they did nothing to get grave markers for Judith and Maria and from what I've read, Maria's brother "permanently borrowed" all her surviving assets and the things that weren't destroyed by the fire

For whatever reason, the house where the Barsi's lived and where Judith and Maria Barsi were murdered, was not demolished after the murders but still exists as a private home today - there's not even a memorial plaque as far as i know

The houses in Sherwood Crescent in Lockerbie that were destroyed by the terrorist bombing of Pan Am 103 were never rebuilt... so why was the house where horrific acts of child abuse and an equally horrific murder-sucide occurred left standing and on-sold as a private home as if nothing had happened?