I wonder how common this is? I have different coloured eyes, which can be caused by Chimerism. Twins are very common in my family and I have two brothers who

I wonder how common this is? I have different coloured eyes, which can be caused by Chimerism. Twins are very common in my family and I have two brothers who are identical twins, so I have often wondered whether Chimerism is the cause of my condition (although not enough to do anything about it!).