It’s a real mess because the “mom” did a lot more damage than just leaving that kid without a mother. She also made it more or less impossible for the uncle/dad to have a family of his own, or maybe a different career path.
Remember those comment to uncle/dad at the bar about making a mistake with women? He’s a good looking man, so I’d expect he was in a relationship at the time he took in Towa and it ended in a messy way as a result.
The actress gets to have her dreams come true but she’s taken things from both of them that can’t be measured by money. She doesn’t seem to feel even remotely guilty about it either. In my book she’s a monster.
Also, this might be a long shot, but I believe that Towa already knows or suspects some of these things.