Refinancing for better rate (how to go about this)

[George White]

Hello BP,

I am in talks with a lawyer to have my name put on the deed to my grandparents home. The house still has a mortgage balance with an rate of ~6.26%. I would like to have this rate dropped to current market rates and save them (and myself) some much needed money. I know with my credit history I can get a great rate, but in order to do that I would need to have the property deeded to me.

My question: In order to get the best rate should I have the deed contain only my name as the sole owner in order to get the best financing? Or can additional names be included on the deed (joint tenancy) without negatively affecting the banks loan decision?