I to am tracing CLACKS. My info so far. james (b.1804 married hannah (nee Saywell) b 1802. In 1871 they were living at 3 queens sq, Clanfield. They had the following children. Chalres aged 19, Mary) aged 15 - Emmanuel aged 14 (mr gt grandfather), Susan and James
Emmanuel married Fanny Cottrell in 1877. They lived in Clanfield and had the following chidden. Emily Henrietta. William. Mary (my grandmother) her twin Bertha and Ernest.There was another daughter Susan Blanche.
Bertha - Mary's twin died in Greenwich aged 31 - no idea why she was in greenwich.
Does any of this help
. Barbara Turner