Michael Jackson‘s youngest son, Bigi Jackson, 22, and his mother, Katherine Jackson, 93, are stuck ina strange, but complex, legal battle that has now pitted the grandson against his grandmother over the late pop singer’s estate. It’s a complicated matter with a jaw-dropping amount of money at stake.

Let’s start from the beginning because the family members were originally united in their legal battle when they teamed up to stop the executors of Michael’s estate, John Branca and John McClain, from doing a certain business deal. Nobody knows exactly what that is, but TMZis speculating that it’s the sale of half of Michael’s music catalog to Sony for $600 million. Bigi and Katherine were not in favor of the deal, but “the court ruled against them.” It seemed like the case would be over after that, but Michael’s mother wanted to appeal the ruling, but Bigi did not.