If money was given to a person for a certain purpose, then he does not have the right to spend it on anything else, or to give some of it to anyone, except with the permission of those who gave it to him. Additionally, he must return whatever is left over of it, if there is anything left over.

1- If your father’s aim was to achieve a specific purpose, then you do not have the right to spend the money on anything else, even if he did not emphasise that it was a trust and was only to be used for that purpose. 2- But if he was only advising you [as to how to spend it] and he would not mind if you spend it on something else, then there is no blame on you in that case.