What is the solution for dealing with the prolonged stay of the wife's aunt's husband in the wife's family home, his unsupervised coming and going, especially with the absence of the wife's maharim, and despite the wife's attempts to tell him not to stay, her aunt refuses due to her right to the house and her fear of her addicted husband, given that the wife is still in her family's home (during the engagement period)?

The خال (maternal aunt)'s husband is a stranger to the woman, and it is not permissible for him to enter upon her unless a mahram (unmarriageable kin) is present or something that prevents khalwa (private seclusion), and provided that there is no fear of fitna (temptation/strife). If the خال is trustworthy, there is no harm in her and her husband staying in the house with the wife. However, if the خال's husband is not religious or consumes intoxicants, then caution must be exercised with him. If any suspicion arises from him, firmness is required, and the eldest brother should be informed to take appropriate action. It is recommended to expedite the completion of the marriage and move the wife to her own home, while offering advice and admonition to the خال's husband.