Re someone's post earlier up - Betty -? - yes, you do find that twins often have a dominant one even when identical. With us, 3, the "leadership" changed often, but one was the more dominant, but not excessively so. The nature / nurture argument is interesting, as we were brought up very much together and what was given to one was also given to the others (with one or two exceptions as talents emerged, eg musical sister got a clarinet, we two others did not) but we were all encouraged to do what we did best, regardless. But three distinct if very similar characters emerged.
As for language - well that was me, the more academic of the three ... but that is a much to do with schooling and application, as well as interest, IMHO.
ex W1, via 47 and 11 and now [just] in 34, equidistant from Carcassonne, Narbonne and Béziers, where I hope we'll finally stay!!