 His father Count Carl Israel Douglas (1824-1898) had married a morganatic daughter of Louis I, Grand Duke of Baden who inherited Langenstein Castle and Gondelsheim Castle, and became thus the first count of the Douglas family in the nobility of Baden in 1848.Ludvig Douglas’ son, General Archibald Douglas-Stjernorp, was the Chief of the Swedish Army during World War II.Robert Douglas is buried in the Douglas chapel in the church of Vreta Abbey.