Is it permissible to take a monthly allowance from the store we own without the father's knowledge, while giving the father his full monthly salary, in order to please him and meet the family's needs?

Filial piety is one of the greatest acts of devotion. One must be diligent in showing kindness and maintaining ties with one's father, and in being good to him, even if he mistreats one. The father may take from his son's money what he needs, provided that it does not harm the son, or take something the son needs, and that he does not give what he took to another child. A father taking from his son's salary and depriving him of it, when the son is in need and the father appears to be self-sufficient, is considered an injustice. It is permissible for the son to take from his father's money an amount equivalent to what was unjustly taken from him, even without his knowledge, based on the principle of al-Zafar (taking what is rightfully yours from one who unjustly withholds it).