Legally, that may not be correct -- if deliberate fraud could be proven. As a practical matter, it absolutely is. Dad needs to tell his boy "Let her keep the cheese, you just get out of the trap
Agreed regarding fraud, but that would have been hard to know prior to the paternity test given sex with both men along with the mother’s unambiguous statements regarding the cheating. The gifts were effectively given in the context of knowing about the possibility of cheating... I presume given no hard time line of events was provided.