Tubes Tied, Vasectomy. Whatever
The mother in this story came up with a lie that meant nothing to anybody. She told the OP that she got her tubes tied 20 years ago after giving birth to the OP’s younger sister. Cool, she got her tubes tied. Life goes on.
FFW to the present and mom is pregnant again. Apparently, the surgery was botched, which is pretty rare but not unheard of. However, the dad revealed that she didn’t actually get her tubes tied, but he got a vasectomy. Why would her mom lie about something like this, you ask? Who knows? It probably makes her feel better about herself, and that’s all that matters.