1) I’m a married woman and there was a problem before between my dad and my husband and my sister as well. Anyways my husband prevented me from talking to them. I have stopped talking to them but recently I built my relationship with them without my husband knowing. Is this haram? Or should i stop talking to them?
2) And if maybe there is a duaa I can read to help with his anger and increase his imman?

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1- Keeping ties with one’s family is mandatory, so you don’t need your husband’s permission for that. Do not stop talking to them. Just be wise and avoid him causing further issues for you (so try not to let him find out).

2- I recommend the following Dua:

اللَّهُمَّ رَبَّ السَّمَاوَاتِ السَّبْعِ وَ مَا بَيْنَهُنَّ وَ رَبَّ الْعَرْشِ الْعَظِيمِ، وَ رَبَّ جَبْرَئِيلَ وَ مِيكَائِيلَ وَ إِسْرَافِيلَ، وَ رَبَّ الْقُرْآنِ الْعَظِيمِ، وَ رَبَّ مُحَمَّدٍ خَاتَمِ النَّبِيِّينَ ، إِنِّي أَسْأَلُكَ بِالَّذِي تَقُومُ بِهِ السَّمَاءَ، وَ بِهِ تَقُومُ الْأَرْضَ، وَ بِهِ تُفَرِّقُ بَيْنَ الْجَمْعِ، وَ بِهِ تَجْمَعُ بَيْنَ الْمُتَفَرِّقِ، وَ بِهِ تَرْزُقُ الْأَحْيَاءَ، وَ بِهِ أَحْصَيْتَ عَدَدَ الرِّمَالِ وَ وَزْنَ الْجِبَالِ وَ كَيْلَ الْبُحُورِ

Then say Salawat, and ask Allah to guide him and help him with his anger and other issues