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More Info I got from our family pandit at Haridwar.
Here goes ... (11g) Mukesh (My son) (10g) Mahender (myself) (*), (9g) Dr. Narain (Father), (8g) Mayaram (grand father), (7g) Chellaram (great grand father), (6g) Motumal (uncle of Grand father and cousin brother of Chellaram, who adopted my father), (5g) Harchandrai (father of Motumal) and Manikmal (father of Chellaram), Dialdas(4Gen) (Father of Harchandrai and Manikmal), Vilandrai (3Gen), Hemandas (2Gen), Motumal.
In this List the last name -- Motumal was probably arora / kalra of the lohana gotra and had two sons Gehimal and Hemandas. Gehimal's clan became Gehanis, and Hemandas' clan became Hemrajanis ...