Statistics. I am using statistics from CASA, but there are plenty of other web sites that have statistics on social problems.
Or just ask you local pastor, or any ER nurse.
seventy percent of children who are abused are abused by a substance abusing adult. Most are not moms with post partum depression, or the cases you read about in the newspapers.
Children with parents who use drugs and heavy alcohol are four times as likely to be abused. Twenty thousand kids are taken from mom because they are obvious addicts. A half a million kids (at least: I believe the actual number is higher) are raised by grandparents, aunts or other relatives because their parents can't do it. I see many kids taken from druggie parents by family pressure but sometimes welfare forceably takes the kids and places them with family. Half a million kids are up for adoption at any one time.
Of course this has nothing to do with your good family. You aren't really your brother's keeper.
That one almost slipped by me. Why get so rudely personal? It's totally out of place in the discussion.