I was in education for 75 years, as a kid, at teachers' college, a school as a classroom teacher who completed two degrees at night, as a principal and as a supervisor of students on prac from 3 different universities. I appreciate and hear all the great comments about teaching. Fraze23, years ago I ran a unit of work, designed by parents, implemented by me with the help of parents running groups. I asked if any parent would like to actually teach a lesson. One parent, a confident business woman in her late thirties, put her hand up. I gave her all the resources that she needed, she watched me teach a couple of lessons then it was her turn. She didn't do a bad job for her 30 minute lesson but afterwards, perspiration running down her face, she told me that it was the hardest thing she had ever done - one lesson!
So my advice to any parent telling you that she/he is better qualified to prepare lessons, effectively present lessons and to professionally assess students' work, that he/she would be an outstanding candidate to be a guest teacher for a day in your classroom. I bet that the string of excuses would be a mile long.