National Amusements — the entertainment company founded by Ms. Redstone’s father, the 95-year-old mogul Sumner M. Redstone — asked in its suit that the court rule on what took place during a meeting at CBS headquarters on May 17. At the meeting, Mr. Moonves and his fellow CBS board members voted 11-3 to dilute the Redstone family’s voting share, which amounts to roughly 80 percent of the company.

National Amusements argued that CBS’s bid to shrink Ms. Redstone’s influence over the company was “invalid” and a violation of its bylaws. The day before the meeting, Ms. Redstone amended the rules so that any vote required a “supermajority” of at least 90 percent.

It is now up to the Delaware court to interpret the meaning of the board’s vote. If the court chancellor sides with CBS, Ms. Redstone’s voting share will be reduced to less than 20 percent. If the ruling favors her, she will remain firmly in control of a company known for shows like “Survivor” and “60 Minutes.”

The National Amusements complaint also includes interesting tidbits from the company’s recent history, chronicling — from Ms. Redstone’s perspective — the stop-start efforts by National Amusements to combine CBS and Viacom, a company whose properties include Paramount Pictures and MTV.

Deep within the pages of argument and legal hairsplitting, the complaint describes a Jan. 16 meeting between Ms. Redstone and Mr. Moonves on the “long-term plans for CBS.” The two executives, who were allies until recently, discussed a “two-step process starting with a merger with Viacom that would strengthen both entities,” according to the suit. After the merger, “the stronger combined entity” would then be put up for sale or merged with a third company. In that case, according to the suit, National Amusements would be “open to the possibility of relinquishing its voting control.”