Hi Samalyna! The only thing I could find was an Arthur L. Bowker born [1863] in Mass, son of Winslow L. Bowker born [1826] in Mass and Susan E. Bowker (nee ?) born [1838] in NH, all 3 living in Cambridge, Mass in 1880 per US census. Also found a Winslow L. Bowker born 1825 in Cambridge, Mass (F/M not shown.)
Also found a Leland Bowker born 5 April 1883 in Ohio. Is this your dad or an uncle or...? But you probably already have this info. May I ask why you posted your msg on the Singapore board? My 2x grt gm, Maria, married a man named Bowker. He was her 2nd husband. They lived in Singapore in the late 1800s. Hope some of this was useful.
Jane