The Dhai Ghar (also written as Dhaighar) Khatris [1] originally consisted of three family groups of North India – Kapoor/Kapur, Khanna and Malhotra or its alternatives, Mehra, Mehrotra, Mahara as used in different parts of India.
To quote Sudhir Kakar[2]
The Khatris were divided into sub-castes. The highest was the dhai ghar (i.e Two and a half houses – the number three being considered unlucky) grouping, comprising families carrying the surnames of Malhotra, Khanna and Kapur/Kapoor.