With all the homework and tuition classes they have to run off to, how do parents ensure they have some time to their school-going kids when they get back home from the office, tired as well? What kind of activities can we indulge in that doesn't require any brain work or physical torture?

it depends on your energy levels and age of the child. sometimes, a simple thing as a tub bath can be super relaxing and fun way to indulge in water play. also, lying down in bed and speaking softly while the lights are out can also be a great way to bond at bedtime and go off to sleep together.