Genesis 44:27 Meaning

25And our father said, Go again, and buy us a little food.

26And we said, We cannot go down: if our youngest brother be with us, then will we go down: for we may not see the man's face, except our youngest brother be with us.

27And thy servant my father said unto us, Ye know that my wife bare me two sons:

28And the one went out from me, and I said, Surely he is torn in pieces; and I saw him not since:

29And if ye take this also from me, and mischief befall him, ye shall bring down my gray hairs with sorrow to the grave.