Rupert Murdoch is engaged in a legal fight with some of his children, as he tries to hand control of his media empire to his eldest son, Lachlan, a battle with major ramifications for the future of the mogul’s two companies.

Murdoch, 93 years old, controls a trust that holds the family’s substantial stakes in News Corp NWSA 1.06%increase; green up pointing triangle, parent of The Wall Street Journal, and Fox News parent Fox Corp. Under its terms, when Murdoch dies, voting control would pass to four children—Lachlan, James, Elisabeth and Prudence.

Recently, the elder Murdoch sought to amend the trust to consolidate power in Lachlan Murdoch’s hands, according to people familiar with the situation. He encountered stiff resistance from the three other children who were slated to inherit some control of the trust.

That has sparked a legal battle that is playing out in a Nevada probate court, a person familiar with the case said. Murdoch has argued that the changes he is seeking to make to the trust are warranted because they will be in the interest of all stakeholders, some of the people familiar with the situation said.

The New York Times earlier reported on the legal battle within the Murdoch family.