This is hard to answer without knowing what was filed 43 years ago. The Brewington Standard in Alabama allows for post minority support of a mentally challenged child. If the father has ever been ordered to pay support, the court could now order him to support his child. I do not believe back child support could go back over a 44 year span. This is goign to take reseasrch from an attorney. I would hire one now.
This advice does not constitute an attorney client relationship.
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