Is it permissible for a woman to contract a legitimate marriage, documented, with a married man without the knowledge of his family and wife, and without a guardian, but with the knowledge of a limited number of close acquaintances, in order to escape loneliness and harassment, and with the family's rejection of this marriage?

Marriage is a great matter that safeguards one from temptations and is obligatory for whoever fears temptation for themselves. Parents do not have the right to prevent you from marrying on the pretext of children. However, a guardian (wali) is a condition for the validity of the marriage. If he refuses without a legitimate religious reason, then the more distant guardian or the judge can marry you off. Polygyny is permissible for whoever is able to be just, and neither the man's family nor his first wife has the right to object to it. She is not permitted to seek a divorce merely because of polygyny, but she has the right to demand justice. If marriage to this man is not facilitated, then seek someone else. It is permissible for a woman to seek husbands or offer herself respectfully and modestly. Increase in supplication and turn to Allah, for He is near and answers the call of the supplicant.