She is, indeed, a member of the gens, but not related by blood.

家庭是由有血缘或婚姻关系的一群人组成的。

youdao

The children, although not related to us by blood, had become as dear to us as our own.

这些孩子，虽然和我们没有血缘上的亲属关系，也变得像我们亲生的一样亲了。

《柯林斯英汉双解大词典》