Zhuge Liang is a relative of Liu Biao?

The relationship between Liu Biao and Zhuge Liang is that Liu Biao is Zhuge Liang's uncle, Zhuge Liang's mother-in-law, and both Huang and Liu Biao are sons-in-law of Cai Biao, while Cai Biao's son is subordinate to Cai Mao and Liu Biao, that is to say, Liu Biao is Zhuge Liang's wife's uncle and Cai Mao is Zhuge Liang's wife's uncle.