Question

I usually......my grandparents on sunday​

Answer 1

I usually visit my grandparents on sunday

Answer 2

I usually visit my grandparents on Sunday

Я обычно посещаю свою бабушку и дедушку по Воскресеньям

Answer 3

It seems like your sentence is incomplete. If you could provide more context or complete the sentence, I'd be happy to help you further. For example:

"I usually visit my grandparents on Sunday." "I usually call my grandparents on Sunday." "I usually have dinner with my grandparents on Sunday."