He married Garsenda, daughter of Ermengol of Albi, and probably had three children. His sons were Raymond II, whom he associated in the countship by giving him Rouergue (before 898), and Ermengol, who inherited that same province. It has been suggested for onomastic reasons that Odo was the father of Garsenda, wife of Wilfred II of Barcelona.
^Suggested by Szabolcs de Vajay in "Comtesses d'origine occitane dans la Marche d'Espagne aux 10e and 11e siècles. Essai sur le rattachement de Richilde, de Garsende et de Letgardis, comtesses de Barcelone, et de Thietberge comtesse d'Urgel au contexte généalogique occitan," Hidalguía 28 (1980), pp. 585-616, 601-2. (Cawley, Charles, Toulouse ftn173, Medieval Lands database, Foundation for Medieval Genealogy, retrieved August 2012,[better source needed])