Have to agree with Nickle on this one. A family is what you make it- regardless of who is the actual grandparents etc.

My kids have many people in their lives who are 'grandparents' who love and care for them equally. They are:
My grandparents (in their 90's)
My parents
DH's parent
My aunt (who also has her own grandchildren, but treats mine just as she treats her own)
A friend in their 60's who migrated to Aus about 5 years ago and has no family here.

I respect every one of them and see the joy they bring to my children as well as the joy my children bring to them. Most see the kids at least once a week- and all live more than an hour away.