We were extremely busy as parents, and DS & DDL are also extremely busy.
I was a stay-at-home mother for very young children a few years before I started graduate school, at night. Frankly, I could not have "worked" any harder, as it was constant, than I did as a stay-at-home mother to little ones. Feedings, diapers, cooking, constant cleaning, constant surveillance, illnesses, doctor visits, ER visits, playing with, teaching. When I started working - someone had to do what I was doing during the time frame while I was at work although I tended to be the one who took them to the bus stop, did homework with, and went to teachers meetings after I started working.
DH also worked very hard, and had to commute into the city. Other than a one year stint in city I was able to work locally which allowed me to stop at home a few times a week which was a big plus.
We did not have a big house or new cars. Our BTD was education, tutors, sports activities, lots of food, clothes and foot ware, and when they got older car insurance.
DDIL is a stay-at-home mother and couldn't work any harder, in particular due to one of the children have special needs. .