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1·That seemed clear enough, but things got tricky when the nonwhite ancestor was a grandparent or a great-grandparent and the minority blood became increasingly diluted.

这看来够清楚了吧，但当非白人祖先是祖辈或曾祖辈，少数种族血统越来越稀释时，情况又变得微妙起来。

2·The family structure of the Chinese type is more complicated, the traditional of happy family is all family lives together including grandparent and great-grandparent .

中国式的家庭结构比较复杂，传统的幸福家庭是四代同堂。

3·The so-called blood-fraction laws of 1705 ruled that anyone who was at least 1/8 black — which meant one black great grandparent — could not be labeled white.

1705年所谓的“血统分数”法律规定，任何人只要有1/8的黑人血统——即有一位黑人曾祖辈——就不能认作白人。