I think some folks are confused about HPM. There was HIRAM MAXIM ('father') and... HIRAM PERCY MAXIM ('son') HPM was a minor inventor who had success with mufflers and the 'Maxim Silencer'. His big passions were ham radio, film making, cars,and writing. His writing resulted in a screenplay that was pretty well known in its day (you can dig out that trivia). HPM was an enthusiast who actually made things happen. HM ('Hiram') was a 'Maine'iac who deserted his wife and child and became SIR HIRAM Maxim in England. He was a major inventor , best known for the machine gun, which basically enabled WWI . Less known is his profound mechanical skills and the invention of the STEAM POWERED PLANE, which more accurate JUMPED rather than FLEW before it crash landed. HM was wealthy from his patents. Folks understandably confuse the two and thus assume that HPM was a very wealthy man. That was actually his father. HPM was 'well off' but not nearly as wealthy as his father. I do not know if HPM and HM had a 'normal' father son relationship beyond HPM's childhood years. My recollection is 'no'. Hope this helps.