I agree with @pjani it is a 7 year commitment. I know you say your parents are in good health and so was my Mum who did my sister's childcare. She was fit and well, 61, energetic, then suddenly unwell with a dodgy hip overnight. She thought it was arthritis and that is what her Mum had. Had a hip xray and turns out she was riddled with cancer, no symptoms whatsoever before the hip. She died less than 3 months later despite chemo.
My Dad fell apart losing his wife, the love of his life, so although he was physically able to collect the children he was also emotionally vulnerable and sad. Fortunately the children were at the end of primary so he only had to do it for 18 months before they were both in secondary.
You always need to consider how you will manage this without family support. One parent could fall ill and the other becomes their carer or hospital appointments or chemo appointments etc. It is just something to bear in mind.
A variety of people do drop off and pick ups. Mums, Dads, step parents, grandparents, childminders, before school clubs off site, before school clubs on site. I have taken friend's children into school if they have a sick sibling or just meetings they can't avoid etc.