I don't think that Legolas is the heir, but I think it's possible that because Elves can live for so long that they don't have heirs in the same sense that Men do. I think it possible that Legolas was the only son of Thranduil because Elves in general don't have a lot of children (Feanor aside) and if there were only one or two brothers we would have heard of these other (male) Elves. I think Legolas had sisters.
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