Of course you have a right to ask and there's nothing wrong with asking, but like all things where you ask other people to do something different, they have the right to say no. I try not to ask people to do things if I'm not willing to accept the answer. I've had people ask me for things, I've said no, and they keep asking as if the answer's going to change, or they are trying to manipulate or coerce or wear me down into saying yes.

One thing to consider in asking anyone to change is whether this is something where you are trying to script them into a particular role or otherwise "use" them. A relationship where you have to have someone say or do particular things like they are following a screenplay is not much of a relationship. It's not always easy to tell when this is what you're going for as opposed to a healthy request for the other to help you, especially healthy in the context of T. Only you can determine this for yourself.