We aim at determining the magnetic structures of some YbMn6(Ge,Sn,X)6 (with X = Ga or In) representatives with neutron powder diffraction experiments performed on the D1B high-flux diffractometer. We recently showed that in YbMn6(Ge,Sn)6, there is a composition range within which intermediate valency Yb does magnetically order at an astonishingly high temperature (up to 110 K). Substituting Sn/Ge by Ga or In allows changing the valence electrons concentration and crystal field parameters, hence altering the magnetic behaviour of Yb. This study will help nderstanding the magnetism of intermediate valency Yb.