Question 459) - When does Sadaqatul Fitr become Wajib?

A: It is wajib at true dawn of 'Idul Fitr. someone who dies before that need not have it paid on his behalf. Similarly one who is born or accepts lslaam after that is not obligated nor is it Wajib on his behalf.

~ al-Quduri ~

Question 457) - Is a man obligated to pay on behalf of his wife and adult children?

A: No, even if they are of his household, just as he is not obligated to pay for his slaves whom he buys and sells.

~ al-Quduri ~