I don't believe ancestry, other than perhaps coloring, really matters. People in the same country don't always look alike but one may resemble another from a different nation.
I don't believe either man looks like a son of Robert Redford. The resemblance for me is more about the mannerisms. One example is how RR and LD would move their respective heads to get the hair out of their eyes without using their hands. A child may look like either parent and not the other, both, or neither but nurtured over nature behavior often stands out and can be telling.
BP, LD, and RR don't physically look closely related except for maybe being blondes. Physically speaking, I believe LD and Rick Schroder should have played brothers. They've had similar builds.
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