Because that demonic uncle deeply hated and envied his sister because he felt their mother loved her more. But I think it’s just his delusional mindset that made him think that was the case. It’s implied in a at least one panel that he was a violent child so he might be NPD or Antisocial. Either way, his sister died shortly after the FL was born, so he can only take his sick frustrations out on her daughter
Tbf I'll never understand people that blame children for the faults or so called sins of their parents. Like c'mon they never asked to be born neither can they pick and choose their own parents, children are like the epitome of innocence (whether the innocence is in a good way or bad way is another debate). I just don't understand how you can be so petty to someone not even half your age. I wish the unc loses his wealth in stupid ass decisions and then suffers and lives to see Laura live happily despite all the sufferings she has to go through by his hands

How deprived of humanity must someone be to be willing to pay four times the amount someone of your bloodline rightfully deserved, only to ensure she wouldn't inherit even a single dime? And how full of unfilial conduct one should be to not allow a granddaughter to bid a final farewell to her grandmother? How could someone bear such intense hatred for a child, to deprive her of the fatherly love she craved her entire life? I abhor the existence of such a man.