Comment by ubertaco

>We don't think we have the competence to be a teacher. We would never presume to teach someone else's kids.

While this is a good and rational awareness of one's own capabilities, as someone who grew up in Bible-belt homeschooling circles and saw a wide variance in approaches and effectiveness, the "homeschool co-op"/"homeschool group" model where one parent teaches one subject to many kids, classroom-style, is super common. See, for example, "Classical Conversations" [1], a pretty common one in my area, that leans on "parent as classroom teacher to many kids", without much in the way of prerequisite qualifications.

[1] https://classicalconversations.com/