Rubuta ci gaba ga wannan sakin layi - An haifi Lumsden a cikin jirgin ruwa na Kamfanin Gabashin Indiya "Rose" a cikin Bay of Bengal. Ya shafe shekaru shida na farko na rayuwarsa a Bengal, inda mahaifinsa Kanar Thomas Lumsden ke aiki a matsayin jami'in Artillery. Mahaifinsa Thomas ya shiga Rundunar Bengal a 1808 kuma ya yi aiki a cikin Yaƙin Anglo-Nepalese
, Yaƙin Anglo-Maratha na Uku da Yaƙin Anglo-Burmese na Farko da suka sami bambanci. Dan uwansa na farko da aka cire shi ne masanin ilmin gabas Matthew Lumsden. Yana da 'yan'uwa shida, uku daga cikinsu sun yi hijira zuwa Kanada, yayin da ƙaramin ɗan'uwansa Peter ya bi hanyarsa zuwa Indiya.