The mental competency of media mogul Sumner Redstone is at the center of a battle to be heard in a Massachusetts courtroom.

Viacom chief executive Philippe Dauman and board member George Abrams sued Redstone last month after both men were stripped of their roles as trustees of entities that control Viacom Inc. and CBS Corp.

In their lawsuit, the men allege the 93-year-old Redstone was not mentally competent when he removed them. They also allege Redstone is being manipulated by his once-estranged daughter, Shari Redstone.

The suit was filed in Norfolk Probate and Family Court in Canton because the trust is administered in Massachusetts.

The first court hearing is scheduled for Tuesday.