Show the studies. Especially about grandparents.
"Risk of Psychological Difficulties Among Children Raised by Custodial Grandparents - Similar to other children in kinship care arrangements, custodial grandchildren are reported by their caregivers to have higher levels of behavioral and emotional disturbances than children in the overall U.S. population."link
Not to be harsh but one only needs to look to African American communities to see harsh realities of grandparents rain grand children