On the relative motive of a commutative group scheme
  We prove a canonical Kuenneth decomposition of the relative motive with rational coefficients of a smooth commutative group scheme over a noetherian finite dimensional base. This paper is a follow-up of "On the motive of a commutative algebraic group" arXiv:1312.4171 
Giuseppe Ancona, Annette Huber, Simon Pepin Lehalleur
math.AG math.KT