Looking for ancestors in US family RANDBY

I am looking for ancestors in US that I’m not aware of. I have an uncle living in US that I know of and have contact with, this people I’m looking for is his grand uncle and grad aunt. My great great grandfather had at least 6 children and at least two of them ended up in US. Some other of them visited US once or more times. I am pretty sure that one of his sons Eivind Ferdinand Randby went to live in US and got married and had children. He was born 1866 in Kristiania (now Oslo). After some family pictures I think he (only the names of the children are on the pictures so I assume that this is Einar) had at least two sons Einar Walter Chester (Randby) and Harald (Randby) the photographs are taken in Boston Mass. one dated December 1912. It looks like the two brothers were in the army and I think Harald ended up in the navy and Einar as a rifleman and served in France after a picture where there is written (debarkaline comp)? Bordeaux. It also is written on the back side of another picture of him in uniform 1185-3 comp? What makes it a little more tricky is that another picture shoves a girl and on the back side its sign Einar and this picture is taken in Pittsburg. There is no girl on the family picture taken in 1912 and the photo is obvious newer than the one with the girl on. The other ancestor is Susi Anna Kristine Randby, she got married but after what I’m told she got no children. She was born 1873 in Hammerfest (north of Norway) were her father my grand grand father served as a custom clerk for a period before he moved to Kristiania and Drammen. I was mistaken her, she did not emigrate to US. My great great grandfather’s name was Han Jacob Jacobsen Randby born 1839 in Ullensaker about 35 kilometers north of Oslo and his wife’s name was Martha Marie Randby (b. Henriksen). If somebody could help I will be grateful.