Reply To: Why Didn't Hilni Sit in a Kosher Sukkah?

Anyhow, I made a mistake. The whole sukkah was higher than 20, the kosher part was wide enough to be good anyhow. So it wasn’t b’davka, but I think it’s still a fair question, why wouldn’t she have it built at 20 or below to be yotzei in her section.

To add a bit to the question, there’s a machlokes whether or not a mother is mechuyeves in chinuch. If she’s not, then the expectation that the sukkah would be kosher for her sons is based on the assumption that she would even keep mitzvos that she wasn’t obligated to keep. (see P’nei Yehoshua).