'Acknowledge' in the Bible

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

who said of his father, and of his mother, 'I have not seen him;' Neither did he acknowledge his brothers, Nor did he know his own children: For they have observed your word, and keep your covenant.