מדרש אויף בראשית 29:15

When Laban heard the tidings of Jacob, the son of his sister, and the power of his might which he had displayed at the well, he ran to meet him, to kiss him, and to embrace him, as it is said, "And it came to pass, when Laban heard the tidings of Jacob, his sister's son" (Gen. 29:13). "And Laban said unto Jacob, Because thou art my brother" (Gen. 29:15). Was he then his brother? Was he not the son of his sister? This teaches thee that the son of a man's sister is like his son, and the son of a man's brother || is like his brother. Whence do we learn (this)? From Abraham, our father, because it is said, "And Abram said to Lot, Let there not be strife… for we are brethren" (Gen. 13:8). Another verse (says), "And when Abram heard that his brother was taken captive" (Gen. 14:14). Was he his brother? Was he not the son of his brother? But it teaches thee that the sons of a man's brother are like his own brothers.

“Laban said to him: Indeed, you are my bone and my flesh, and he stayed with him a month’s time” (Genesis 29:14).
“Laban said to him: Indeed, you are my bone and my flesh…” – he said to him: ‘I was thinking to render you a king over me, but now that you have nothing with you, “indeed, you are my bone and my flesh.” I will strip you bare like this bone.’
“He stayed with him a month’s time” – Rabbi Ami said: The Torah teaches you etiquette. For how long must a person tend to his relatives? It is up to a month.
“Laban said to Jacob: Because you are my brother, shall you work for me for nothing? Tell me, what is your salary?” (Genesis 29:15).
“Laban said to Jacob: Because…shall you work for me for nothing?” Is that possible?³⁰Did Laban really plan on paying Jacob fairly for his work? It is, rather, if he performed a task for ten silver coins, he would give him five silver coins, and if his delivery was worth six silver pieces, he would give him three silver pieces.³¹That is what Laban wanted to give as payment for Jacob's work. He said to him: ‘What do you think, that I came because I want your money? I came only because of your two young women.’