Sforno on Genesis 32:1/ספורנו על בראשית ל״ב:א׳

1ויברך אתהם. Our sages have already told us not to belittle the value of a blessing pronounced by a layman, a person of low social standing. (Megillah 15) The reason why the Torah tells us of Lavan’s blessing to his daughters is to remind us that when a father blesses his sons he does so wholeheartedly, with his material and spiritual faculties. We know that Yitzchok blessed with all his soul from his own words (27,4) When the one bestowing the blessing himself reflects the image of G’d he had been created in, then such a blessing is likely to be correspondingly more effective.