Question
Is it permissible for the fiancée to join a group of the fiancé's sisters for acquaintance, where there may be excessive joking?
Answer
I say, and with God's success: The groups that do not have a clear benefit from family ties, or inviting to God, or spreading goodness, or learning, it is better to leave them and stay away from them; because their harm is greater than their benefit, and they cause countless problems. You should assess the interest in staying or not, and God knows best.