If I'm not mistaken Windows Hello will only do facial recognition on a depth-sensing camera, so you would need to create a 3D model of my face to fool it.
Twins are easily distinguishable if you know them -- I went to high school with three pairs and they were easy to tell apart. Almost everyone has some pockmark etc. on their face, and Identical twins often have these in mirror image.
The infrared might help: the capillaries transporting (hot) blood under the skin probably grow somewhat randomly per individual, giving everyone a slightly different pattern of heat running through their face.
