Here is a damning Twitter thread comparing the article to Lola's published obituary: https://twitter.com/caulkthewagon/status/864656017480708102 It makes the author and his family a lot less sympathetic.
I didn't find the author very sympathetic. He obviously knew something was wrong but never did enough to fix it. I think the article was more of a confession than anything. I get the feeling that the author was wracked with guilt.
This is actually quite typical of kids (especially in asian cultures?). Being timid and following your parents orders wholeheartedly are so ingrained it's criminal. The children could only do so much as young teenagers; I question the eldest more because he was 20 and has noticed the slavery for a while yet didn't do much to help their Lola (or maybe he did, the author just failed to mention it).
Regardless, it seems like you're being unsympathetic to the author and his siblings. You don't know what they've been through: poverty, fear, abandonment, humiliation, anxiety, etc (speculations). It's a whole lot easier to judge someone's situation based on your current status and upbringing. Just because you think you would've been more resolute if you were in his place doesn't mean that you actually would have been. Remember, this is a family from Asia in the 60-70s.
Not an attack. Just a reminder to put things in perspective.