That you can't call yourself a sahp once dc are at school.
After all school is only 190 days per year and only six hours a day.
A school aged child could be as young as four and still requires lots of input from parents.
Assuming you have a couple where both work the childcare and home responsibility should be shared.
Yet with a sahp they generally do the lot and rightly so during the week
So aibu to think that a sahp of school age dc is still a sahp.