He is married to Baroness Armgard Kunigunde Alharda Agnes Oda von SIERSTORPFF-CRAMM.
They got married on October 24, 1905 at Hannover, Hannover, Preußen, he was 24 years old.Source 6
http://trees.ancestry.com/pt/AMTCitationRedir.aspx?tid=159732775&pid=1319/ Ancestry.com
Bodo Ulrich Georg Julius Rudolf Gf von Oeynhausen<br>Gender: Male<br>Birth: Sep 29 1881 - Celle, Hannover, Preussen<br>Marriage: Spouse: Armgard Cunegonda Alharda Agnes Oda Von Cramm - Oct 24 1905 - Hannover (Stkr. Hannover), Preußen, Germany<br>Death: Nov 29 1909 - Hannover, Preussen<br>Parents: Graf Erich Ernst Karl Bodo Andreas Hubertus Friedrich Ludwig von Oeynhausen, Therese von Oeynhausen (born von Lenthe)<br>Wife: Armgard Cunegonda Alharda Agnes Oda Von Cramm
http://trees.ancestry.com/pt/AMTCitationRedir.aspx?tid=114784053&pid=785