Thanks for your reply. We were told by our tax agent that we couldn't do it because the loan was already closed and if we wanted to reopen it the only way would be as Jamie said to sell a portion of the home to my wife or vice versa.

We were wanting to put the loan onto our current home so that we could use at least half the loan for investment for tax deductions rather than all for the home we are going to be moving into to live.