thy son's
Genesis 37:3
Now Israel loved Joseph more than all his children, because he was the son of his old age: and he made him a coat of many colours.
Genesis 44:20-23
20
And we said unto my lord, We have a father, an old man, and a child of his old age, a little one; and his brother is dead, and he alone is left of his mother, and his father loveth him.
21
And thou saidst unto thy servants, Bring him down unto me, that I may set mine eyes upon him.
22
And we said unto my lord, The lad cannot leave his father: for if he should leave his father, his father would die.
23
And thou saidst unto thy servants, Except your youngest brother come down with you, ye shall see my face no more.
Luke 15:30
But as soon as this thy son was come, which hath devoured thy living with harlots, thou hast killed for him the fatted calf.