Looking For Descendants Of Major James Jackson (1810-1879) Madras

I'm looking for descendants of Major James Jackson(1810-1879).He was acting Resident Councillor of Malacca,Malaysia in 1858.Son of Major-Gen.George Jackson & Mary Greir Lee..He was acting Resident Councillor of Malacca,Malaysia in 1858. He served in the 14th Regiment Madras Native Infantry and retired at the end of 1861.He married 1stly to Mary Travers,2ndly to Ellen and 3rdly to Ellen Weldon.Later he was promoted to Lieutenant-Colonel.His issue - > > > ai)Mary Greir Jackson(1843-1879)married 1stly Charles Evan MacDougall and 2ndly James Walker Bernard.Their issue:- > > bi)Winifred Mary Alice McDougall married Stephen Prescott White D'Alte Sellon.Their issue:- > > ci)Stephanie May Sellon(1885-1931)married Adolphus Reginald Zouch Porter.Their issue:- > > di)Barbara Stephanie Porter(1911-2002). > > dii)Reginald Nevill da Costa Porter(1916-?) married Lindsay Diana Molesworth.His issue:- > > ei)Valerie Lindsay Porter(1942-?). > > eii