Mahendra Goswami, who was a batman (a soldier assigned to a military officer as an assistant) of Colonel D L Sah, and a carpenter Akhtar Ali who worked at his house, were arrested in connection with the case on Sunday, SSP Janmejay Khanduri said today.
However, another accused named Mallu is still absconding, he said.
A sketch has been released to speed up arrest of Mallu, the SSP said.
They also made away with jewellery worth lakhs of rupees and Rs 25,000 in cash from the house.
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The cash and some of the jewellery have been recovered from the arrested duo.
However, the gold ornaments are believed to be in possession of the absconding accused Mallu.
Prerna Sah (55), wife of Sah and his mother Shanti Sah (75) were found dead in rooms of his residence in Dehariya area of Haldwani.
The officer's son and daughter-in-law are also in the armed forces.