Important to note, it's very much an issue for the elderly and sick family. Not so much an issue for the person whose life gets derailed and cannot find love due to the overbearing demands of a less-than-grateful relative (which _might_ be whats happening here? very hard to know, but that seems to be what the person is demanding, that the woman abandon her love life and essentially live as her relative's slave).

Manipulative people copy commonly know (often stereotypical) stories as cover to whatever they're really doing.

Real stories, and manipulative fake stories , would be almost exactly the same, because one is copying the other. The manipulative stories are often slightly more realistic or interesting as the person telling it has had a second chance to refine it from the original version.