You and Grandma is important if there is no you and Grandma. I might not have today because you and Grandma compared the background that makes me succeed in school.
Grandpa and Grandma are important people. If there is a grandfather and grandmother. I probably will not be today. The grandfather and grandmother like a background that made me successful in the classroom.
Grandpa and grandma who is important. If there is no grandpa and grandma, I might not today. Because grandpa and grandma is behind that I succeed in learning.