It sounds as if there is a possibility that you and I might be 2nd cousins.much depends on your age and your Father's age....I am 48, my father who died June 2000 was 75 and his father (my grandad) was Robert William (born 1893)
It could be that your granbdfather, henry, was one of Roberts brothers.....the henry I have on this line was born in 1872, and had brothers and sisters named......
Rose (1868) Agnes Laura(1870 - 1893) Bertha (1877)Mildred (1880) Daisy Constance Victoria (1886) John Thomas (1884) ...(this is the Uncle jack I previously referred to - actually a great uncle)......and 3 others I do not entirely know for sure.
let me know if you have any cross-referenced detail on this
regards the coat of arms.....please send me an address and I will post you a copy.