Favoritism in the Bible

INSTANCES OF

Genesis 29:30 And he went in also unto Rachel, and he loved also Rachel more than Leah, and served with him yet seven other years.
Genesis 29:34 And she conceived again, and bare a son; and said, Now this time will my husband be joined unto me, because I have born him three sons: therefore was his name called Levi.

1 Samuel 1:4-5 And when the time was that Elkanah offered, he gave to Peninnah his wife, and to all her sons and her daughters, portions: 5 But unto Hannah he gave a worthy portion; for he loved Hannah: but the LORD had shut up her womb.

Genesis 27:6-17 And Rebekah spake unto Jacob her son, saying, Behold, I heard thy father speak unto Esau thy brother, saying, 7 Bring me venison, and make me savoury meat, that I may eat, and bless thee before the LORD before my death. 8 Now therefore, my son, obey my voice according to that which I command thee. 9 Go now to the flock, and fetch me from thence two good kids of the goats; and I will make them savoury meat for thy father, such as he loveth: ...

Genesis 37:3-4 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. 4 And when his brethren saw that their father loved him more than all his brethren, they hated him, and could not speak peaceably unto him.

Genesis 43:34 And he took and sent messes unto them from before him: but Benjamin's mess was five times so much as any of theirs. And they drank, and were merry with him.

Deuteronomy 21:15-17 If a man have two wives, one beloved, and another hated, and they have born him children, both the beloved and the hated; and if the firstborn son be hers that was hated: 16 Then it shall be, when he maketh his sons to inherit that which he hath, that he may not make the son of the beloved firstborn before the son of the hated, which is indeed the firstborn: 17 But he shall acknowledge the son of the hated for the firstborn, by giving him a double portion of all that he hath: for he is the beginning of his strength; the right of the firstborn is his.