Hewlett-Packard has rounded on board member Walter Hewlett, claiming his arguments against the company's $22.3 billion bid for Compaq Computer displayed a "simplistic anti-merger bias".
HP's response to Mr Hewlett's anti-merger case came in a position paper that was sent to shareholders, in a bid to cement approval for the controversial deal.
Mr Hewlett was the first of the Hewlett and Packard heirs to publicly oppose the deal, but David and Lucile Packard have since joined him in plans to reject the merger.
FT.com reports an HP spokesperson as saying: "We believe Mr Hewlett's recent opposition to the merger is based on a static and narrow view of HP and the industry, selectively ignores the synergies of this transaction, relies on faulty financial assumptions and analyses, and offers no alternatives to address HP's challenges and opportunities."
But a spokesperson for Mr Hewlett hit back yesterday, arguing that he had been well received on Wall Street. The Hewlett camp argued it was the company's filing that relied on faulty assumptions and analysis.
HP and Compaq are stressing the benefits the deal would provide to the enlarged company's enterprise business.
They have argued that the two companies' complementary product lines in PCs, servers, storage and services support the merger.