מדרש אויף בראשית 29:13

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.

“Jacob told Rachel that he was her father’s brother, and that he was Rebecca’s son, and she ran and told her father” (Genesis 29:12).
“Jacob told Rachel that he was [her father’s] brother, and that he was Rebecca’s son” – if being deceitful, “that he was her father’s brother”; if being righteous, “that he was Rebecca’s son.”
“And she ran and told her father” – Rabbi Yoḥanan said: A woman is always accustomed only to her mother’s house. He²⁷One of the students. raised an objection: ‘But is it not written: “She ran and told her father”?’ He said to him: ‘It is because her mother had died. Who should she have told if not her father?’
“It was when Laban heard the news of Jacob his sister’s son, he ran to meet him, embraced him, kissed him, and brought him to his house. He related to Laban all these matters” (Genesis 29:13).
“It was when Laban heard…” – he [Laban] said: ‘Eliezer was the most defective one of the household, as it is written: “The servant took ten camels” ²⁸The verse states that he was only a servant. (Genesis 24:10); this one, who is the most beloved of the household, all the more so.²⁹He will have riches with him.’ When he did not see even a knapsack, “he embraced him” – he said: ‘They are dinars and they are in his belt.’ When he found nothing, “he kissed him” – he said: ‘Perhaps they are gems and they are in his mouth.’ When he did not see anything, Jacob said to him: ‘What do you think, that I came bearing money? I came only bearing words’ – “He related to Laban.”