Does the intermingling of the questioner's money with her family's money, earned from unlawful sources, constitute a reason for her prayers not being answered, and what is the religious stance regarding her situation, given that she is unable to change her family's circumstances or get married?

May Allah relieve your distress, ease your affairs, rectify your father, and grant you a righteous spouse. If lawful and unlawful wealth are mixed in your family's money, eating from it is not forbidden, but rather disliked. It is only forbidden if you know for certain that the food was purchased with specifically unlawful money. And lawful sustenance is among the reasons for the acceptance of supplications. So, if you can separate your living arrangements from your family without harm, that is preferable. We advise you to treat your family gently and counsel them in the best manner, seeking help from Allah, then from those who have influence over them. As for marriage, it is a way out for you from this situation, so strive for it and seek help from those who can assist you. There is no harm in a girl seeking a husband. The hadith, "No flesh that grew from ill-gotten gains shall enter Paradise, rather the Fire is more befitting for it," is an authentic hadith, and it is a warning that may be averted by repentance, forgiveness, or the mercy of Allah.