There is no world where this situation ends well. The sister-in-law can either choose to be a part of it or sleep easily knowing that she didn’t enable her partner’s sisters’ bad behavior.
Sister-in-law tells expecting 23-year-old single mother of 3 that she’s selfish for having another baby: ‘She has a 4-year-old, a 2-year-old, and an 8-month-old; the older two are from a deadbeat.’