Mortgage Issue

Hello I am not sure where in the forums this exactly fits in. In 2008 I purchase my first property and I put it into mine and my brothers names. I paid the deposit however a quite sizable amount (circa 100k). Unfortunately i am really concerned about things as my brother has proved to be quite bad with money and even had a stint of loosing money at gambling. I am concerned that in the future if he amounts any debt through this or other means that my home could be taken away from me. I am only taking precautions here, there has not been any clear evidence of him doing anything bad, but i am worried nevertheless)

Does anyone have suggestions what to do? I cant do a transfer of equity at the moment as I have just started a new business. Is there any legal declaration that can be done to protect myself as much as possible?

Thankyou

ANewHope