Dear Irene,
Would your grandmother be Princess Evgenia Mikhailovna born 1914 and died 1976, daughter of Prince Mikhail Nikolaievich born 1883 and died 1924, who was the son of Prince Nikolai Mikhailovich born 1845 and died in 1918, who was the son of Prince Mikhail Abelovich who was born on 10 April 1809 and was also known as Melhisedek?
David