Nephew's parents want to add maths tuition. I'm the one who sees how tired he is by 9
My nephew stays with us on school days and goes home to his parents at weekends. His maths in the first unit test was lower than they expected, and they've found a tuition centre near our place, four evenings a week, 6 to 7.30. They are paying and it is their decision. But I'm the one at home on weekday evenings. He already finishes homework around 8 and is half asleep at dinner. I don't want to overrule his parents or sound as if I know better. How would you raise this, as the relative who sees the weekday side?