It’s another case in which the law makes something hard out of something easy (Indiana Lawyer, 4/30/19).
Jessica Boyd and Jason Baugh weren’t married and had an off-again/on-again relationship. During that time, Boyd gave birth to two children, both of whom Baugh acknowledged by affidavit to be his. That constituted proof of paternity under Indiana law, so, when the two adults split up in 2010, the court ordered joint custody for Boyd and Baugh.
For unknown reasons, in 2017, Boyd asked Michael Litton to take a paternity test regarding the younger child. She and Litton had had an affair during one of her breaks from Baugh. Sure enough, DNA testing revealed Litton to have fathered the younger of the two children.