The participation of women in the workforce was much lower. There were still a lot of "stay at home Mums".It’s always puzzled me, how we managed in the 1960s, when IIRC commercial “childcare” was comparatively rare. The traditional “family allowance” which became “child benefit” wasn’t expected to pay for childcare.
Did the large majority of working women rely on grandparents help, or just not work at all until children were at secondary school age?
Children of junior school age mostly made their own way to and from school.
Families were less widely dispersed so there would be informal childcare from the extended family. As you say, particularly grandparents.
There was what were called "latchkey children" who came home from school to an empty house.
And, in larger families, older children looked after their younger siblings.