http://www.biggerpockets.com/users/rmoran
I have been through exactly what you are talking about recently.
My older brother passed away and he had no kids, no spouse and no will. Us surviving siblings got together and decided how to divide the estate.
My oldest sister was appointed the Personal Representative (PR) for the estate. She applied for and received the "Letters of Administration" from the probate court which gave her the power of attorney for the estate. It was decided that I would take over his SFH and all the responsibility for it. I started paying the mortgages (he had a second) and all the utilities and taxes, etc. I had everything changed to my name as far as utilities, etc. are concerned. We spoke with a probate lawyer about the best way to transfer that house. He drafted what equals a quit claim deed for me from the estate. We went to the county registrar's office and I had to pay some transfer tax (which was not much) and present the deed along with a certified copy of the Letters of Administration to show that my sister had the power to sign the transfer to me.
It took several months for all the paperwork to line up, but in the end I am the official owner of the house and the mortgage is still in my dead brother’s name. I continue to make all of the payments and even changed the insurance to my name. I have not refinanced it yet and it has been over a year. Recently I rented it out and now make a nice chunk of money from it.
You do not need to refinance it, as long as you keep making the payments. I bought another property in my name in September and since I have no other mortgages in my name at this time, it was a breeze.
Next year I am thinking about refinancing it to pull some of the equity and purchase another rental. I do not anticipate any issues with that at all.