I predict either father will use the seed or daughter will and that MC will have to save the day from them or somethingFather not looking after own family/children because his loved one/wife died trope....while yeah it really does put some depth to the characters but man, that trope feels really overused to me now.
Whatever the case, let's just hope father realises her daughter's value sooner than later
What you don't understand is that they're both broken people."If I can just do this impossible thing, Dad will go back to how he used to be..."
No, he won't. Even if you can break him free of where he is, people don't go back completely. They can't. Their world isn't what it was.
Aim for marginal improvement, not a "cure"