Over a year ago, I purchased a small online business selling life skills curriculum to homeschool and special education families. The main asset was the library of 400+ lessons, each including a short video and PDF. The revenue appeared to reflect meaningful demand for such a program. At the time I purchased the business, the delivery mechanisms were pretty fragmented and browsing the lessons was all behind the paywall. Today I'm releasing a whole new website that brings (I hope) a more modern experience. Principally you can now browse all of the life skills library. I'm also hoping that this approach lends itself to better SEO as well.
While this is pretty far from being able to sustain the family from an income perspective, it's been really neat to connect with families who are taking the initiative to raise capable young adults.
Good luck on your venture!