The group is that is more apt (i.e., likely) to be involved with their grandchildren, compared to the others is: African American grandparents.
African American grandparents are more likely to be more involved with their grandchildren based on the fact that African American households have more tendency or are more likely to be headed or taking care of by single parents.
A single parent can be defined as someone who has a child but does not have a husband or wife that can help in catering for the child or children.
Therefore, te group is that is more apt (i.e., likely) to be involved with their grandchildren, compared to the others is: African American grandparents.
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