The former CEO of Market Basket is suing the company, saying its board of directors illegally removed him from his position .

Arthur T. Demoulas filed the countersuit in Delaware court on Wednesday, five months after he was initially placed on paid leave and three weeks after he was officially fired.

In the complaint, attorneys representing Demoulas wrote that the termination was “not motivated by any rational business purpose or to advance the company’s best interests, but instead [was] at the behest of Mr. Demoulas’s three sisters and their family members.”

The board of directors said at the time that Demoulas had failed to cooperate with the board on fundamental business interests and succession planning for the 70-year-old CEO’s eventual retirement, and claimed that he had been

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