Holm and Maynard got engaged on the ABC dating show earlier this year but were recently forced to deny reports that Maynard had been unfaithful to her fiancé.
© Twitter / @EmilyMaynard
Holm's brother Mike later gave quotes to Us Weekly, alleging that the reports of Maynard's infidelity were "100% true".
Jef Holm, who complained about his brother's remarks on Twitter, has now told People that his whole family is "shocked" by Mike's comments.
"My family all says they are shocked, and obviously I'm shocked," he said. "But if everybody knew the history he had with our family, no-one would be surprised."
Holm, who described the rumours as "100% false", added that Mike has "a history of doing hurtful things to the family".
"He's been cut off from a lot of family things because he's so dishonest," he said. "It's so disturbing to think that a family would do this... [But] as hurt as I am, I love him and I love my family."
