Is it permissible for children to participate in a commercial project by paying cash shares, or through a debt that will be settled in the future or deducted from the inheritance upon death?

It is permissible to give money to children who are not financially capable to participate in a project where their capable siblings have paid their shares, on condition that they repay it later or from their share of the inheritance. This is considered an act of kindness and does not violate justice among the children.