Lurker from 6-9, but this post made me laugh, if only because my MIL is the same way...
DH and almost everyone in his family have blue eyes; MIL's are green. I, like everyone in my family, have brown eyes. When DS was born, he had the non-descript newborn blue eyes. Cue regular conversations with MIL about what color DS's eyes would be, mostly along the lines of them being blue or green. By the time he was two months old they were looking brown. By three months there was no question. Then in late September we were visiting with DH's stepsister and her new baby. Stepsister says she thinks her son might have brown eyes. MIL says, in front of me and DS, "Oh, I hope not, brown eyes are so boring!" I said, "HE [pointing to my son] has beautiful brown eyes!" MIL responds with, "Oh, does he?" looks, and says nothing further.
In November, DH's paternal grandmother died, and my MIL went back East for the funeral. She called me from her hotel and started talking about how DS looked just like DH's grandmother, right down to the eye shape, and then said, "And I think she even had brown eyes. I bet Nolan gets his brown eyes from her." Fortunately my SIL corrected her by pointing out that the dearly departed's eyes were blue.
I have at times felt I too I am merely an incubator for my husband's clone, and as though my 50% contribution of DNA is meaningless. Hang in there and try to have a sense of humor about it.