Very tangentially I'm reminded of a book called White Teeth (by Zadie Smith) that I found compelling (I was living in England at the time).
Some others have commented that the author feels like things like children are an imposition. Superficially, I see why, but I think that misses the point.
She hints at this in other parts. How she comes across to me is I think what must be typical of many first generation immigrants (those first to be born in the country or who emigrated there in childhood).
You see stories like this where a family comes to the US from Russia where someone who was a doctor now works as a janitor to give his or her children a better life. I think it must be common to get knocked down several rungs on the social ladder when making this kind of move. But it's a sacrifice many parents make for the sake of their children.
Having gone to Princeton and Harvard (as the author and her brother did), they became fairly high achievers, which is to be applauded but is also I think the exception. It must be a huge part of their psyche to remember where you came from, coming to the US with nothing, living as a refugee on virtually nothing and so on.
One affect that has on someone, and I think you have to have experienced poverty to some degree to truly appreciate this, is the inescapable fear that all that you've worked for in life might go away, be taken away. Those who aren't first generation immigrants or came from money I think just don't appreciate this lack of security as it's not something they're typically exposed to or have any experience with.
I'm not even sure the author realizes it even though it's what I took from the piece. Perhaps the book will explore this (the book is mentioned at the bottom). Perhaps it's an editing snafu with the excerpt.