What does a voluntary fasting person do if he is invited to a meal at a relative's house?

Question:
He says: I am accustomed to fasting on Mondays and Thursdays, and on days like these, occasions for friends and relatives are frequent, most of which are on Thursdays. What is the ruling? Should I continue my fast, knowing that some relatives get upset if we do not eat with them on Thursday or Monday?

Answer:
Responding to an invitation is a right of a Muslim over another Muslim. If someone invites you, respond to them, especially to the invitation to a wedding feast. Is it obligatory to respond to the invitation to it? It is recommended to respond to invitations in other cases, even for the fasting person. The fasting person attends and responds to the invitation; it is not a condition for him that he eats. He attends, sits with them, socializes with them, makes du'a for them, and leaves without eating. If he wishes, he may break his fast and eat, because voluntary fasting does not obligate the host. It is permissible for him to break his fast, and it is permissible for him to remain fasting and make du'a. Because the purpose is his presence, being seen with people, and socializing with them.