'Acknowledge' in the Bible

but he shall acknowledge the first-born, the son of the hated, by giving him a double portion of all that he hath; for he is the beginning of his strength; the right of the first-born is his.

Who said of his father, and of his mother, I have not seen him; Neither did he acknowledge his brethren, Nor knew he his own children: For they have observed thy word, And keep thy covenant.