.... im Nordgau

Sa mère était sans doute une soeur du puissant margrave Ernest († 865), seigneur dans le Nordgau et dans la marche de Bohême, à l'origine de la famille des ducs de Bavière.

• https://fr.wikipedia.org/wiki/B%C3%A9renger_Ier_de_Neustrie

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Brother and sister, parents not known: 

-http://fmg.ac/Projects/MedLands/GERMAN%20NOBILITY.htm#sisErnestMGeb...
25. daughter . The relationship between the sons of Gebhard and Ernst is clarified by the Annales Bertiniani which record that "nepotes ipsius [Ernestus]" were expelled from the kingdom in 861[86]. If the suggestion by Jackman concerning Gebhard's affiliation (see below) is correct, he would have been the brother-in-law not brother of Ernst [I], married to the latter's sister.

m GEBHARD, son of [EUDES Comte d'Orléans & his wife Engeltrudis ---] (-after 879). Jackman suggests that Gebhard (ancestor of the Konradiner) was the brother of Ermentrude, first wife Charles II "le Chauve" King of the West Franks, therefore the son of Eudes Comte d'Orléans and his wife Engeltrudis[87]. However, this appears chronologically doubtful if Gebhard is identified with "Gebehardus" who founded Kloster Kettenbach, as recorded in the charter of "Ludowicus…rex" dated 31 Mar [845] in which the king donated property "in pago Heinriche villam…Lierschiet" to Kloster Kettenbach "in pago Logonense iuxta fluvium Arda" by "vir…fidelisque noster Gebehardus" by charter dated 31 Mar 845[88]. Graf im Niederlohngau, east of Frankfurt-am-Main in the Aardbergen[89]. Nevertheless, an interesting possible corroboration for Gebhard's relationship with the Konradiner family is provided by the Annales Bertiniani which record that "Adalardo Yrmintrudis reginæ avunculo" was "propinquo" of the brothers Udo (ancestor of the Franconian Konradiner family), Berengar and Waldo who were expelled from Germany in 865[90], and in a later passage that "Adalardo…et suis propinquis Hugonis et Berengario" fought the Vikings in 865[91]. "Adalardo" was Adalhard [I], maternal uncle of Gebhard assuming the relationship is as shown here, and the brothers Udo, Berengar and Waldo were of course Gebhard's sons. Graf im Niederlahngau. Monk at Gemünden 879.

Gebhard & his wife had [five] children: