Is it permissible to give charity on behalf of my father's cousin, with a value of 22 Palestinian Pounds that were deposited before 1948, of which 17 Pounds were used to purchase weapons for the revolution and the remaining five Pounds burned with the house, or should the amount be returned to her children?

If your father disposed of the amount deposited with him without the owner's permission, then he is liable for it and must return it in full to her heirs, whether it was damaged or disposed of. It is not permissible to give it as charity on her behalf as long as she has heirs. If your father passed away and left behind wealth, then this debt must be paid from it. If he did not leave wealth, then paying it is considered an act of righteousness towards him. However, if his disposal was by order of the owner, then he is not liable for it in Islamic law.