As his co-worker FUJIWARA no Tadataka was a fine equestrian despite being a noble, Tadamori seemed to get along with him, and Tadataka's son, Takanori married Tadamori's daughter.
同僚の藤原忠隆は貴族でありながら乗馬の達人で意気投合するところがあったのか、忠隆の子・隆教は忠盛の娘を妻に迎えている。