Grandparents Raising Grandchildren Discussion

Can you help me understand this Psychology question?

DQ1

Why is there such a high correlation between raising grandchildren and mental health issues for the grandparent? What, according to Kelley, Whitley, and Campos are solutions to the mental health issues? What are the public health implications of grandparents raising grandchildren?

DQ2

Review the kin selection theory and the compensation theory discussed by Segal, Norman, Graham, and Miller. Based on what you reviewed, do parents prefer their biological children? Why or why not? What treatment issues occur with foster homes in which there are biological children?