A person has a son who lives in an apartment in his father’s house rent-free. The son pays the electricity…

A person has a son who lives in an apartment in his father’s house rent-free. The son pays the electricity bill, water bill, food expenses, and all other living expenses for his wife and children from his own money. Based on this, there are three issues as follows: First Issue: Is the father required to pay a portion of the fast-breaking zakat (zakat al-fitr) for his son because he allows him to live in his house without rent? Second Issue: Is the father’s provision of an apartment for his son to live in considered a form of support, thereby making the father responsible for part of his son's expenses? Third Issue: What is the criterion for calculating the father's share of the zakat al-fitr if the fitrah is to be distributed between the father and the son? For example, if the father takes care of the rent, does this mean that the rent equals half of the fitrah, so the father is responsible for half of the fitrah, or does it equal a quarter, so the father is responsible for a quarter of the fitrah?