You are studying green colorblindness in your family (colorblindness is recessive and on the X-chromosome).
Please answer which of the following observations is NOT possible under normal circumstances (Please check all that apply):

a) Your mom and sister are colorblind, but your dad is not colorblind.
b) Your mom and sister are not colorblind, but your dad is colorblind.
c) Your mom and dad are not colorblind, but your brother is colorblind.
d) Your mom and dad are not colorblind, but your sister is colorblind.
e) Your dad and sister are colorblind, but your mom is not colorblind.