Is the money my deceased father set aside for my trousseau mine alone, or should I divide it among my married sisters and me?

The aforementioned amount is considered part of the inheritance and must be divided among all legal heirs, because the father's intention to donate the money for your marriage preparations was not completed due to his death before you took possession of it. Thus, the donation became void, and the money reverted to the estate. If the adult and mature heirs wish to give you their share, there is no harm in that.