Generally, speaking - if you both own the same type of interest (units in the case of an LLC) and there are no special terms in the operating agreement - the answer would be no.

 

However, you should really get professional advice before you consumate any deal.

A simple question equates to a simple response.  And i agree with Robert.  But there is a lot more to your story, which i'm sure Robert could (and would) elaborate on presuming you told the story.

 

You haven't supplied enough information to provide informed advice.  But keep this in mind when it comes to control:  "Money talks, and b.s. walks."

 

Make sure you're getting something of measurable value before you issue a "controlling" interest.  And then when you think it's of "measurable value" ensure you tie in the performance metrics to legally ensure that value has been met.