I think you may have found a connection for Alexandrina Crichton. My nana Isabella Fyfe Wann Scott came to NZ in 1924 after her husband John Scott ( from St Andrews) was killed in WW1. Nana had 3 brothers, Alexander, David( also killed in the war ) and Jimmie. I have done the crichton family tree back to 1760.I live in NZ but I have contact with all of my cousins removed in Fife Scotland, from the other brothers except our elusive Alexander.I have lots of documents but have been unable to find his off spring.
Please contact me if you get this message and I can swape information with you.