Chelsea Clinton looks extremely like her maternal grandmother, Dorothy Rodham. Same facial structure, same cheekbones, same shape of the mouth, same set of the eyes and nose, etc. The resemblance between grandmother, mother and granddaughter is very strong.
Dorothy and Hugh Rodham, and children circa the early 1950's:
Here's a pic of, from left to right, Dorothy Rodham, her granddaughter and her daughter:
Hillary Clinton in her high school portrait; Chelsea looks a lot like Hillary did in her youth.
Don't descend into the gutter with the Dems. Then you'll have room to criticise them when they do.