How often do your kids see their grandparents? Is once a week okay?

I live with my parents so they see my kids everyday and I didn't have in-laws to worry about. However, I do have grandaunt-in laws that wanted to see my son so we do a rotation. One weekend in Aunt A's, the next day in Aunt B; so we'll have at least 1 day of the weekend to ourself, and another for family. It somehow works unless someone in the family is sick.