Is the money collected from the deceased's colleagues to assist his widowed sister's family considered an inheritance, and who among his family members is entitled to it?

The financial aid collected by the deceased's colleagues for his family is not considered an inheritance, because it was not part of his possessions during his lifetime. If the donors specify how these funds are to be spent, they must be spent as specified, even if the beneficiary is wealthy, as this is not zakat (definition) but rather a gift or charity. However, if they do not specify how the funds are to be spent, the money is given to the needy members of his family, and the most deserving is the one whom the deceased used to financially support during his lifetime.