#1 Shane's father

One of the worst narratives on Smackdown Live for the last few months had been Shane McMahon and the Miz's friendship, as these two unlikely partners became friends after Shane had filled for an injured Miz at the Crown Jewel event.
From there on out, we had witnessed Shane and Miz take their partnership and develop into a blossoming friendship, discussing their daddy issues, aspirations in life and their career goals for the future, and there is no doubt this had to witness some of the sappiest storytelling in wrestling history.
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Thankfully this narrative came to its climax at WWE Fastlane when Shane destroyed Miz and his father, as Shane was fed up of carrying the Miz on his shoulders for months, and on Smackdown Live this week we got to hear from an emotionally charged Miz on how Shane's betrayal affected him which led to Miz accepting Shane's Wrestlemania challenge.
Now that Shane has turned heel it only makes sense that he aligns himself with his father, as Vince and Miz's father getting involved in this match at Wrestlemania would be a sort of novelty that one would expect from a match like this.