IF you do remove it, first have a pot of soil ready to put it into right away. IF you don't, it will dry out quickly, which will probably kill it. It's touch and go whether it will survive anyway. Pot it up, put in a stake to keep it upright, and set it in the shade for a week or two, to help it survive.
The roots of the two will absolutely be intertwined, so yes, you will have to break some roots to get it out. Pulling at it a little bit every day for a few days might be a good way to go. Place the fingers of one hand on the surface of the soil to try and preserve the roots of the bigger plant, then pull with the other hand?
