嫡系[dí xì]
词典direct line of descent：嫡系；嫡派。
词典danci.911cha.com
词典one's own clique：嫡系。
词典closest ties of relationship：嫡系。
嫡系的反义词
（一线相传的派系） direct line of descent:
例：他是英国名门贵族嫡系出身。
The best blood of English flows in his veins.
（正支） one's own clique; closest ties of relationship