That is entirely up to you. If you can handle doing two at once with the same plot, I would be happy to do it. As a possible alternative, I don't fully know what your plans are with how the plot will play out, but if the other person is also hoping to play as the boy, perhaps we could join into a three way RP and I could try my hand at the otherwise NPC of the boy's sister. It's just an idea, though, as I do not know who the other person is wanting to play.