Responses
Well originaly Ml raised Luca, and when they were hunted down and his death was eminent he told Luca "i raised you out of obligation and never loved you" and he was being brutaly honest.
Just like Ml is to FL.. he will tell her stuff like "here have this necklas/ jewlery" and be overly nice to her (he treats her like he is corting her and even sugest marrige) but its all out of a sence of duty as Luca's uncle.. and he has no atatchment to Fl or Luca atm.. thats why Luca hates him..
Its also sad that FL found her self falling for him.
wait, did Luca in the first timeline already wish?
If so, im guessing his wish might have been "to have a loving family, or somone who loves and cares for him". I can imagin his shock, finding himself as a child again with this neglectful aunt. The shock of seeing the aunte trying to be nice to him and give him a loving home, protect him and look out for his best intrest. Luca just officialy showed he cares deeply for Fl now :) and sees her as a loving family member, hench why he hate Ml.