Looking for my grandfathers brother

Looking for any info on my grandfathers brother his name is Shannon Selwood birth date possibly 1928? My grandfathers name was Brian Selwood born April 8th 1926 in Devon. Their mothers name was Alice Maude Gardner 1892? They lived for some time in somerset. My grandfather married Gertrude Egan in 1950-51 then moved to Liverpool. During that time I believe Shannon went to austraila for a period of time. My grandfather went to Canada in 1954-55?