What is the ruling on a husband preventing his wife from speaking with her cousins or sitting with them in the presence of family and the husband and under Sharia-compliant controls, and preventing her from speaking with her friends who talk to young men, knowing that she is religiously committed? And is it permissible for the husband to waive these prohibitions?

Understanding should prevail in marital life. A husband's jealousy over his wife and his eagerness to protect her are good things. A woman talking to her non-mahram paternal cousins and sitting with them is a cause for temptation and suspicion, and the husband has the right to prevent her from doing so to protect his religion and honor. As for her talking with her female friends from whom no corruption is feared, he should not prevent her from it. However, if he does prevent her, obedience to him is obligatory. A wife's obedience to her husband in what is good is obligatory. Even if a woman is upright and committed, she should not feel safe from the guile of Satan. If there is no sin or suspicion in the matter, there is no harm for the husband in compromising; rather, he should allow it. But if there is sin or suspicion, he is not permitted to be lenient, because that is among the requirements of qawamah (guardianship/responsibility).