The Doyles Are All Right

Jake eventually comes to the realization that he is more than just a Doyle, he is also 50% of whatever his mother was. Though Malachy is hesitant to provide many details about his mother, Jake is eventually able to figure out her maiden name and track down her family (he does have those Doyle detecting skills after all). As expected, Jake takes an interest in this new family and wants to get to know them and which genetic traits/powers he may have because of them. Obviously, through all of this Mal feels spurned. Wasn't he a good enough father? Can't Jake just be happy to be a Doyle? Eventually Jake realizes that even though he may be technically 50% of whatever his mother was, functionally he is 100% Doyle.