Willing To Give Me Custody

by C
(South Dakota)

My daughters mother called and said she wanted to give our daughter to me, or else to each have her 6 months out of the year. as of now she has custody. is there a way to do this on our own, maybe specific paperwork to fill out? We live in South Dakota. Also does anybody know. If you each have you child 6 months out of the year does anybody pay child support?