I have a handful of kids, all with the same dad. 4 different hair colors. Straight, curly, wavy. 2 blue eyed, 2 brown. Different complexions, different face shapes. They did not even look related as kids, though all have some resemblance to me or their dad's mom. As adults and older teens now, they do look more alike because they are similarly built, but if you didn't know you wouldn't think they were siblings.

This drove my ex crazy when he want through his wacko racist phase.