Neither Jacob nor his mother understood that, if God promises to bless you, you don’t have to cheat or steal to get it.
In fact, you can’t steal a blessing anyway. Having attempted to “steal” Esau’s blessing, he wound up leaving with nothing at all, and Esau inherited everything. Jacob wound up working for 20 years for a guy who cheated him over and over... and yet once God made good on his promise to bless him, cheating him was pointless. He got his blessing in spite of what his father-in-law did.
You do note that cheating seemed to run in that family, everyone cheating everyone. The father-in-law cheating Jacob, the wives cheating each other and their father, their sons selling one another out. God evidently didn’t choose them because they were the most noble people, but because he saw what they could be, not merely what they were.
I’ve often wondered, in a good way, the line from Jacob started with a great deception, and perhaps deception is part of their nature. When one contemplates things like the last Temple, how the legal bloodline of David was preserved through Mary and the virgin birth, the art of deception, in a positive way, becomes apparent.
Words of wisdom.