I didn't thought it would be possible, but veriface can be tricked by a not so similar looking person. My sister got to log in just by sitting in front of the computer and we are not twins. We have different skin, hair and eyes colors and it was as simple as sitting down!!!!
Even though we're siblings, there's no such a resemblance between us, so that the parameters can match. I rised it to the higher level, and still have my password, but it's not as I was told. Somehow I feel a bit dissapointed.