Aconite said:
Pretty much. But go back a bit and you run into the opposite situation, where the children went to the father by default.
Probably largely due to women dying in childbirth, way back when.
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Note: I'm not an attorney either, but I did work for one for years.
You asked what an attorney might argue for their client in order to get the children.
A Mother's attorney would probably go with the "children need their mother more during the early years" argument.
Most cases where Dad fought for the kids seemed to involve the argument that Mom was an unfit Mother or couldn't/wouldn't provide properly for the kids. Maybe she isn't giving them the emotional care she should be or they are living in an unsafe environment.
One case that sticks in my mind . . .would have been in 1980's:
Dad's attorney arguing that he should have the children because Mom was having boyfriends (overnight) in the house with the kids there. The Judge really ripped her for that, but did not take the children from her custody.
He did tell her he would consider it if she didn't get her act together. This, the unfit portion, would have been what he based his argument on I think. In support of his assertion, he also included:
The old "she's spending child support money on herself instead of the kids." That usually falls on deaf ears as long as the child has proper housing, food, etc. They never seemed to understand that cs money wasn't for clothing and toys and dental appts,alone. Housing, groceries and utilities are included in that mix also.