Background information: Eliezer comes to town looking for a wife for Yitzchak and Rivkah has just offered Eliezer and his camels water.
Eliezer proceeds to tell the whole story of his journey and the request of his master, Avraham.
Lavan has ulterior motives. He doesn't want to be a good host, he wants a nice gift. He only cleared the house and made room for the camels since this guest looked like a choshive guy.
(מב) לבן, היה בו עין הרע ורוח גבוהה ונפש רחבה. וכל השתדלות לבן שרץ להקביל פני אליעזר והסכמתו להשידוך הכל בשביל ממון, וכן אמר הכתוב (בראשית כד, ל) ויהי כראות את הנזם ואת הצמידים על ידי אחותו וכשמעו את דברי רבקה אחותו וגו' ויבא אל האיש וגו'. הענין הוא, היה חמד הממון, וגם לבן הוא איש רמאי. והנה כראות את הנזם והצמידים, חמד לממון ונתלבש ברמאות, דהיינו כששמע דברי רבקה אז ידע שבא אליעזר בשביל השידוך, על כן רץ נגדו להשדה לדבר עמו בסוד אם הוא רוצה ליתן לו כך וכך סך מרובה שוחד אזי יסכים הוא עם השידוך, ואם לאו אזי ימחה כי הוא גדול הבית. וזה הרמאות רמזה התורה במה שהודיעה ששמע לדברי רבקה אחותו, שאז ידע שהוא ענין שידוך.
(42) Laban was possessed of עין רע, he was ill-willed, begrudging, he was haughty and greedy. His whole concern in approving the match was to secure personal gain. The Torah is careful to document how Laban was motivated by money when we are told: "As soon as Laban saw the nosering and bracelets on the hands of his sister etc.,… he ran towards the man" (24,30). Laban was a swindler to boot. Realising that Eliezer had come to propose a שידוך, a match, he whispered to Eliezer that in consideration of an appropriate amount of money he would side with him and approve the match. Should Eliezer refuse, he, Laban would oppose the match; he was the most influential member of the household. When the Torah reports that "Laban had heard the words of Rebeccah his sister," this is our clue that he knew that a match was going to be discussed. Eliezer had no option but to promise Laban what he had asked. The reason the Torah does not report all this is because it simply never came to this.
(א) ויען לבן ובתואל. רָשָׁע הָיָה, וְקָפַץ לְהָשִׁיב לִפְנֵי אָבִיו:
(1) ויען לבן ובתואל THEN LABAN AND BETHUEL ANSWERED —He (Laban) was a wicked person and so rushed in to answer before his father.
Lavan did not realize that any person was greater than he was. He only showed respect to Eliezer because he appeared rich, and Lavan did not think that his father, who was older and wiser than he, had anything more valuable to say than what could be said in Lavan's own words.
(יב) וַיֹּאמֶר אָחִיהָ וְאִמָּהּ תֵּשֵׁב הַנַּעֲרָ אִתָּנוּ (בראשית כד, נה), וּבְתוּאֵל הֵיכָן הוּא, בִּקֵּשׁ לְעַכֵּב וְנִגַּף בַּלַּיְלָה,
Her brother and mother said, "let the girl stay with us." And where was Bethuel? He wanted to split apart the marriage and was struck by an angel (killed) at night.
Was it not for the best that Lavan spoke before his father? Besuel wanted to call off the marriage, while Lavan remained noncommittal! Even so, Lavan lacked fundamental respect for his father, so the last encounter that Lavan has with his father was disrespect. Lavan himself said that the match was made by HaKadosh Baruch Hu, but he didn't believe that enough to let his father have a say.