Harry’s father William Gem had twin sisters: Helen Maria and Mary born in 1795. Helen died in January 1873 and Mary in March of the same year.
Helen’s grave may be found in Warstone Lane Cemetery, Jewellery Quarter, Birmngham just uphill from Harry’s grave. (Section: P, Grave No: 1527).
In the photograph below Harry’s grave lies centre left background (shuttering around the new grave architecture construction) and Helen’s is centre right next to the path.