Timothy de Villiers (1875-1930) is the twin brother of Jonathan de Villiers. Together the twins are the carnelions and they separated the gene line into two. Timothy is the ancestor of Falk and Paul de Villiers and of Gwyenth Shepherd, her biological sibling and mr. Bernard. And possibly also of Kenneth de Villiers and his sister, judging on Kenneth's resemblance with Falk.
Since Timothy and Jonathan were identical twins, they were both born with the gene and as the same gemstone. During their lifetime they made experiments with the chronograph. During WWI they stayed underground with Lady Tilney, Jade. He obvious had a least one child at some point. He died in 1930, while Jonathan lived for 14 more years.