In short, Carloman & this brother inherited titles from Pepin the Short
He was the second surviving son of Pepin 
the Short and Bertrada of Laon and was a younger brother of ... Be that as it may, 
Pepin the Short's disposal of his kingdom appears to have exacerbated the bad... [DOC] [TLE] Ppin (714 - 768) - Genealogy - Geni [PAR] Oct 13, 2016 ... Pepin the Short III King of Franks in FamilySearch Family Tree .... a share in the 
inheritance, but he was imprisoned in a monastery by his two half-brothers.