The acoustic has always been a bone of contention, as Silva has claimedFrances gave him the guitar as a gift - something that was denied by Frances. In addition to its high sentimental value for Cobain, the guitar is said to be worth millions.
Isaiah claims his wife gave him the guitar as a gift but Frances refuted this, insisting in court documents she would never have handed over a "priceless family heirloom".
After five years of dating, Frances married Silva back 2014 in a secret summer wedding attended by close friends.
Kurt Cobain's daughter Frances has prevailed in a legal battle to keep photographs taken at the scene of her father's death sealed from the public, following an application from a conspiracy theorist to have them released.
Two years ago, Hole frontwoman and Cobain's widow Courtney Love gave a statement accusing Lee of trying to exploit Cobain's death, which he claims to have been investigating for more than 23 years. Silva will now get to keep the guitar in the final settlement.
"I think the main reason people embrace the conspiracy theory is simply that it's very painful to imagine that Kurt, someone they loved or maybe identified with, that he betrayed them in some degree by taking his own life", he said.