How can a person deal with family members who commit violations of Islamic law, especially concerning zakat and dress, taking into account that they do not accept advice and may accuse him of being overly strict?

The questioner is advised to be patient, forbearing, wise, gentle, and to arm himself with knowledge to admonish and guide his family. Regarding zakat (definition), he can contact one of the well-known scholars or bring an easy-to-understand book of fiqh so they can learn the rulings of zakat, coupled with encouragement, warnings, gentle advice, and good admonition. As for clothing, he can play for them a lecture on hijab (definition) in a style suitable for their understanding or bring them concise messages. He should also frequently supplicate for their guidance and for their affairs to be set aright.