Alvin, Simon and Theodore have a very serious problem that is not really such, because it’s all due to a misunderstanding with their father and mentor, the person who welcomed them into their home.
This is Dave. He’s found a woman he wants and he’s going to tell her in New York. Immediately, the squirrels think that Dave will abandon them and leave them in the lurch after so long.
The reality is not so, but what matters is what they believe. So they devise a plan to prevent Dave from abandoning them, a plan that only takes into account their desires and not Dave’s.
The plan is to do everything possible so that Dave can not declare himself and ultimately do something to break the couple so that Dave can never abandon them.