1. A lineal relative. Including parents and children, grandparents, maternal grandparents and grandchildren, maternal grandchildren. That is, a father cannot marry his daughter, and a mother cannot marry her son. Grandfather (grandpa) cannot marry granddaughter (granddaughter), and grandma (grandma) cannot marry grandchild (grandchild).
2. Collateral relatives within three generations. include:
(1) Brothers and sisters from the same parents (including half brothers and half sisters), that is, children of the same parents cannot marry.
(2) Uncles, uncles, aunts, uncles, aunts and nephews (daughters) of different generations, namely uncles (uncles) cannot marry the daughters of their brothers (brothers); An aunt cannot marry her brother's son; An uncle cannot marry his sister's daughter; An aunt cannot marry her sister's son.
