Question

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Answer

May Allah bless you with piety (Taqwa) and purity, strong Imaan, forgiveness of sins, have mercy on you, elevate your status, and bless you with knowledge of Deen and generosity. Ameen!

Generally, marriage and in-laws are entangled aspects of a marriage life. In-law interference is indeed a common problem. You have to understand that you are the new member of their family, regardless of how long you have been married. There's no better dua or wazeefa for this besides you working your way through your manners (Akhlaq) to win the heart of your husband and your sister in law. You may feel that your husband is listening to your sister-in-law more than he is listening to you, but once you win his heart
you will know that he will listen to his sister but he will do what pleases you. You have to win over your husband by gaining his love and confidence. Do your best to ignore any issues with your sister-in-law while you seek out a compromise that is acceptable to you and your husband. Perhaps your sister-in-law feels that ever since you have entered her brother's life, your husband doesn't give him her rights. Try to be the better person and give her a share of your rights to show that this isn't a war over your husband.

Start Taleem of Fazail in home, with those family members in your home who are Mahram and can sit together. Schedule 5-10 minutes every evening after Maghrib or Isha, read some Hadith from books of Fazail like Riyadus Saleheen and Muntakhab Ahadith.

Study, talk and think about the greatness of Allah, blessings of Allah, Love of Allah, blessings in Jannah for righteous believer to enjoy, everlasting life in Akhirah.

Daily reading a book of good deeds helps keep your motivation. You may print a chapter of Muntakhab Ahadith

http://www.islameasy.org/quick_books.php

and read for 10 minutes. then make Dua.

http://www.islameasy.org/pdf/Emaan.pdf
http://www.islameasy.org/pdf/Belief_Hereafter.pdf

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