Father's Liar

Amit's wife, Priya, gave birth to their baby boy, Aryan. But Amit's world came crashing down when his brother-in-law, Rohan, suddenly claimed that he was the biological father of the child. Amit's marriage is on the rocks, and Priya is emotionally unstable. Rohan files a petition in family court claiming that he is the real father and seeking joint custody of the child. Amit and Priya are against this and argue that Rohan's claim is false and an attempt to ruin their lives. What legal remedy can Amit and Priya seek in this situation? Can they challenge Rohan's paternity claim? What are their rights as parents in this dispute?