The residency requirement in Maryland is 1 year . The courts in CA cannot decide custody of the child , he/she never lived there . She would be better served by moving back to S. Carolina especially if he hasn't already filed .

He is threatening to file for dual custody where he takes the child for alternating years,

>>>>>>>>>>>> Unlikely .

pays no alimony,

>>>>>>>>>>> SS terms under CA laws are more generous depending on the length of the marriage .

pays minimal child support,

>>>>>>>>>>>> CS will be decided in the state the child resides in , CA doesn't have jurisdiction .

and gives her no portion of their assets.

>>>>>>>>>>>> Haha .