so yesterday my fiance's mom came over to see the 4D sonogram stuff and agreed whole heartedly that…

so yesterday my fiance's mom came over to see the 4D sonogram stuff and agreed whole heartedly that she has her daddy's nose but then looked at him and said she was really surprised that she had his nose. what the hell is that supposed to mean? she is his daughter. why would it be surprising that she looks like him? does she think I cheated on him or something? Or is there some other explanation that I'm not seeing.