Prince Andrew of Yugoslavia
His paternal grandparents were King Peter I of Serbia ( 1844-1921 ) and Princess Zorka of Montenegro ( 1864-1890 ) , while his maternal grandparents were King Ferdinand of Romania ( 1865–1927 ) and Princess Marie of Edinburgh ( 1875–1938 ) . 
<triplet> Peter I of Serbia <subj> Princess Zorka of Montenegro <obj> spouse <triplet> Princess Zorka of Montenegro <subj> Peter I of Serbia <obj> spouse <triplet> Ferdinand of Romania <subj> Marie of Edinburgh <obj> spouse