Hikaru's grandson, MINAMOTO no Atsushi is known to have become MINAMOTO no Mitsunaka's son-in-law and adopted MINAMOTO no Tsuna (WATANABE no Tsuna) of Saga-Genji (Minamoto clan).
光の孫の源敦は源満仲の女婿となり、嵯峨源氏の源綱（渡辺綱）を養子としたことで知られる。