直系 
直系 zhíxì {E} attr. direct; directly related (of one's ancestors and descendants); lineal | ∼ qīnshǔ bùnéng cānjiā chōujiǎng. ∼亲属不能参加抽奖。 One's immediate family is not allowed to participate in the lottery.
直 直 straightaway / straight / needle eye anchor straightaway 系 系 lineage / yarn / ceiling thread lineage