If a mother dies leaving only two daughters. The two thirds of her wealth will certainly pass to her daughters.
Allah instructs you concerning your children: for the male, what is equal to the share of two females. But if there are [only] daughters, two or more, for them is two thirds of one's estate. (4:11)
But will the other third pass only to her siblings who are (still) alive (in the present case only two sisters are alive) or to the heirs of her death siblings too?
And how this third will be distributed?