Amatul Rahmân Omer:
They ask you of your ruling (in the matter of inheritance of a kalâlah). Say, `Allâh gives you His ruling concerning kalâlah (- one who has neither parents left nor a child).´ If a man dies (and) he has no child but leaves (only) a sister (behind), then she shall inherit half of what he leaves. Likewise he (- the brother who is kalâlah) shall inherit her (whole property) if she (- the sister) has no child (and dies). But if there be two sisters (or more) then they shall receive two third of what he (- brother who is kalâlah) leaves. And if they (- the survivors) be brethren, men and women, then for the male is the equal of the portion of two females. Allâh makes (His commandments) clear to you lest you should err. And Allâh knows all things well.