Did your parents tell you never to discuss money and politics with others? When I was younger, I thought that was a stringent set of rules to place on yourself, but as time has passed, it makes more and more sense why it's not always advisable to discuss such personal things. Unless you're married or going to marry someone, there's no reason someone in your life should know precisely how much money is in your savings account. An acquaintance or even a close friend knowing such specifics can lead to resentment that neither one of you bargained for.
It's one thing to discuss money, but asking for someone else's money, especially when it's multiple thousand dollars, is totally out of line, no matter the circumstances. The dad in this story has been saving money for his son for years, and when his ex asked for the money for her other kid's medical treatment, he drew a firm line in the sand.
This image is for illustration only, and the subjects are models; the image does not depict the actual subjects of the story.