karlengemann230insetWM.jpgKarl Engemann, father of Larry King's wife Shawn and ex-manager of Marie Osmond, has found himself in the middle of a bidding war over who will publish a possible tell-all book about the famous singer, a source tells X17online.

Engemann managed Osmond for 35 years, but in November of 2009, the singer fired him. The 80-year-old entertainment manager has since filed a defamation lawsuit against Osmond.

As for the tell-all book, an industry insider tells X17online exclusively:

    "Many don't realize that Marie and Donny don't get along, and off camera, the two have knock-down-drag-out fights. And these fights aren't your typical brother-sister arguments. She fights with Donny about who sings more songs, who says more lines, who has more words, everything. Marie is petty and wants to take credit for things she doesn't do. This book would reveal it all."


Marie and her brother Donny are currently performing a nightly show at the Flamingo Las Vegas.

The performer had plans to walk down the aisle again ... but those plans have changed. Find out what happened ... after the jump.