I wonder if your informant C Ryman on your GG Grandfather WILLIAM HARRISON did indeed turn out to be IVAN CHARLES JOHN RYMAN, the son of MARY ANN RYMAN, born in Bath, Somerset in 1860 and who served in the Military?
If so, he had 6 other siblings, born in Dundee and Broughty Ferry Scotland. A number of his siblings along with his mother moved to the USA in abt 1892 and settled in Paterson, New Jersey. One brother stayed in Scotland and lived in Blanefield, Stirling.
Please contact me about possible Ryman family connections. Thanks!