Absolutely, but try researching a family tree and then implementing it using that model and see how quickly you get lost in the nested list structure. The, as I said in another comment, try adding a child born after you started the lists, ie, before the first UL. Then add a divorce and a new spouse and see how easy that is to logically display the relationship.

To illustrate how HTML so ill suited to this structure, I had another look at the problem and found Treant, because yes, the easiest to do this on the Web and maintain it is to write an entire API.

http://fperucic.github.io/treant-js/