Your father is afraid to be deleted as an elder. If there are others on his body that have personal issues with him or don't like him they could use this as a reason. They can tell the CO that by associating with you and your man he is giving "tacit approval" to your "unchristian" course of conduct. He is not exemplary anymore and therefore must be deleted.
Elders love to throw that word around "exemplary" to qualify or disqualify someone. Yet ask them to explain to you what it means and they wont be able to. Its kind of an umbrella statement to cover non scriptural reasons. lol. so stupid.