وَلَا تَنكِحُوا۟ مَا نَكَحَ ءَابَآؤُكُم مِّنَ ٱلنِّسَآءِ إِلَّا مَا قَدْ سَلَفَ ۚ إِنَّهُۥ كَانَ فَٰحِشَةًۭ وَمَقْتًۭا وَسَآءَ سَبِيلًا ﴿٢٢﴾
你们不要娶你们的父亲娶过的妇女，但已往的不受惩罚。这确是一件丑事，确是一件可恨的行为，这种习俗真恶劣！
Haram Family & relations
Whom is it haram to marry?
Short answer
The Quran lists the women a man may not marry because of blood, marriage and nursing relationships, such as mothers, daughters, sisters and aunts (4:23), and it forbids marrying women whom one's father had married (4:22).
Evidence
Quran
حُرِّمَتْ عَلَيْكُمْ أُمَّهَٰتُكُمْ وَبَنَاتُكُمْ وَأَخَوَٰتُكُمْ وَعَمَّٰتُكُمْ وَخَٰلَٰتُكُمْ وَبَنَاتُ ٱلْأَخِ وَبَنَاتُ ٱلْأُخْتِ وَأُمَّهَٰتُكُمُ ٱلَّٰتِىٓ أَرْضَعْنَكُمْ وَأَخَوَٰتُكُم مِّنَ ٱلرَّضَٰعَةِ وَأُمَّهَٰتُ نِسَآئِكُمْ وَرَبَٰٓئِبُكُمُ ٱلَّٰتِى فِى حُجُورِكُم مِّن نِّسَآئِكُمُ ٱلَّٰتِى دَخَلْتُم بِهِنَّ فَإِن لَّمْ تَكُونُوا۟ دَخَلْتُم بِهِنَّ فَلَا جُنَاحَ عَلَيْكُمْ وَحَلَٰٓئِلُ أَبْنَآئِكُمُ ٱلَّذِينَ مِنْ أَصْلَٰبِكُمْ وَأَن تَجْمَعُوا۟ بَيْنَ ٱلْأُخْتَيْنِ إِلَّا مَا قَدْ سَلَفَ ۗ إِنَّ ٱللَّهَ كَانَ غَفُورًۭا رَّحِيمًۭا ﴿٢٣﴾
真主严禁你们娶你们的母亲、女儿、姐妹、姑母、姨母、侄女、外甥女、乳母、同乳姐妹、岳母、以及你们所抚育的继女，即你们曾与她们的母亲同房的，如果你们与她们的母亲没有同房，那末，你们无妨娶她们。真主还严禁你们娶你们亲生儿子的媳妇，和同时娶两姐妹，但已往的不受惩罚。真主确是至赦的，确是至慈的。
This is general information, not a fatwa. For your own situation, ask a qualified scholar.
Questions about halal and haram
Whom is it haram to marry?
The Quran lists the women a man may not marry because of blood, marriage and nursing relationships, such as mothers, daughters, sisters and aunts (4:23), and it forbids marrying women whom one's father had married (4:22).