Commenters were fairly split. Obviously, there is some familial tension there, but most people were united in the idea that he should have just played the wedding, not ruined her day, and brought it up afterward if he was angry. 

“Her literal wedding day was not the time or place to argue,” a top commenter wrote. “You could have got your parents to pay you afterwards, or (heaven forbid) just played the organ instead of buying her a gift so that her wedding wasn’t ruined.”