Rangku W. Momin was born somewhere before or after 1841 at the hamlet of Watrepara. He was also a brother of Reban and nephew of Omed. While visiting his uncles—Omed and Ramke at Goalpara were asked to admit him as a student, but the Deputy Commissioner advised him to return as desiring no more boys from the particular part of the hills. With much disappointment, Rangku remained silent. However, he stayed there with Omed and Ramke for the time being, and they taught him some alphabets. He was baptized on April 6, 1866, at Nowgong by Dr. Miles Bronson. Rangku was a humble person, patient to study the Scriptures, so well-grounded the doctrines of the Bible, and have a good moral character. As an ex-sepoy, Rangku was a great shikari (huntsman) during those times.