Ousted Market Basket CEO Arthur T. Demoulas is officially challenging his firing, calling on a Delaware court to help him get his old job back.

The grocery chain’s board likened Demoulas to a dictator when they voted to remove him as president and CEO on Sept. 9, a decision that was months of corporate turmoil and public mudslinging in the making.

But in a counterclaim filed Wednesday in Delaware, Demoulas alleges the board members improperly colluded with his sisters, who control about 61% of the company compared to Arthur T.’s 28%. He’s specifically accused the board of taking orders from his sisters, “who seek to line their own pockets,” get a leg up in intrafamily disputes, and “strike at Mr. Demoulas over petty family jealousies,” according to the filing.

Demoulas’s counterclai

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