One sister and the friend are always walking together, whispering into each other's ears, giggling and making coy faces. The other sister walks behind them and wears a very serious expression and sometimes seems kind of mad.
Anyway, my prediction for how these girls will turn out...
The friend and the sister. Look at them gossiping away and attracting attention with their outlandish outfits and cheeky mannerisms.
The other sister, not seeming too happy.