Is it permissible to give zakat to the eldest son who is unable to work due to disability, to the poor grandson (daughter's son), to the sister who is married to a poor and destitute man, and to the indigent maternal aunt?

It is permissible to give zakat to one's sister and maternal aunt if they are poor, and they are more deserving of it than others. However, giving zakat to one's son or grandson is not permissible according to the majority of scholars due to the obligation of their maintenance. Nevertheless, if the zakat payer is unable to provide their obligatory maintenance, then some scholars permit giving zakat in such a case.