then you shouldn't keep having more kids! I don't care what your reasoning- "They're better off with someone else ", "They WANT to live there", or whatever else, if you're not a good enough parent to be able to raise your children yourself, you shouldn't be having more!
This is not about shared custody! This is about moms who send their kids to live with someone else or lose their kids or just can't/don't want to take care of their own children. NOT sharing custody after a divorce because your children are still with you and their father.