TG you don't homeschool judging by your sentence structure and spelling.
I did for my eldest for grades 1-2 but truely my spelling and sentence structure have been none too good.
Is it possible that he's earning the income, while his wife is teaching the kids?
I am afraid you have found the great Achille's Heel of homeschooling...
I believe someone with the "dreaded Education Degree" may be a bit more qualified to teach a child than their parent who murders the English language an average of 5 times per sentence, and who, at the very least, can never be accused of sending others scrambing for a dictionary when they speak.