Ok, if there was no order entered by the court, then he can't be held liable for any child support arrearages since no amount was ordered to be paid.
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The custodial parent would need to file a motion to modify custody in the same court that entered any custody order and request that the court put a formal child support order in place that would compel the noncustodial parent to begin to make support payments. You don't need an attorney to file this motion and it is available either at the court clerk's office or here:
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http://www.flcourts.org/gen_public/family/forms_rules/905b.pdf
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Then if the noncustodial parent doesn't pay, s/he can be held in contempt of court and possibly face jailtime for failure to comply with the court order.
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Thanks.

Barrister

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