Thread: My great gran & granfather what happened

I am new to this site and i need help in tracing my great gran and great granfather. My great grans name was Martha ann kerr. My granfathers name was Thomas docherty. Idont know very much about them what i do know is that my great gran Martha ann docherty died giving birth to her daughter Helen docherty. She was born on 23 september 1917 in Armagh Ireland. Her father my great granfather was a soldier when my great gran died giving birth to Helen he left and went to America. To my knowledge he never seen his daugther again. His daughter was brought up by her aunt lizzy kerr. as far as i know they left Ireland between 1939 and 1940 and went to scotland. Where my gran lived and died. I am trying to find information on what happend to my great granfather did he go to America, why didnt he see his daughter. And my great gran did she die giving birth to her only child. I just want to know what happened to them does anybody know where i could start looking?