He evidently returned to Germany in late 1862 as he was baptised there, at age 25, in Berlin Stadt, Brandenburg on November 24th [IGI: Batch C999113].
His future wife was Louisa Ellen Ashlin, born in 1840 [GRO Ref: Lambeth 4 183, 1840 (Q4)] to parents Spencer Ashlin and his wife Louisa (née Harvey) who had married at Battersea on July 12th 1837 [IGI: Batch I022163]. She was baptised at St. Matthew, Brixton on November 22nd or 23rd (the register is unclear) [IGI: Batch P015611].
Caesar and Louisa married in 1863 [GRO Ref: Wandsworth 1d 544, 1863 (Q1)]. Their wedding took place at Holy Trinity Church in Clapham on January 31st 1863 [IGI: Batch M058452].
By now he had already founded his sugar broking firm ‘Czarnikow & Co.’, in 1861, trading for a year or so at 18, Philpot Lane and then, from 1862 until his death, at 29, Mincing Lane. The firm later became ‘C. Czarnikow Limited’. Around 1865 he bought the house in which he was to live for two decades, ‘Elm Court’ in Lower Green, Mitcham. It had been built in the mid-1820s by John Parrott, in yellow brick with an Ionic porch, and was located near the cricket green. Caesar extended it by building wings on either side, as seen below.