She is jealous because her husband cares more about his sister than her
Question

                I never used to quarrel with my husband before.i love him very much.i have 5 month old baby.i'm very worried now thats why i'm requesting your kind suggesion.  

my husband has a sister she with her husband and three children resides near our flat.whenever i my husband his sister and her husband goes out to buy things my husband and she will go together without minding me and her husband.she used to call my husband everyday in his office.she want him to ask her oppinion in every matters.so sometimes i feel very bad and quarrel with my hus.i know thats not good for a mulim woman so i used to ask him to forgive me. she used to tell him things like her daughters periods and all.she used to complaint her husband in most of the matters.is it correct. i want to know whether a man has more responsibility for his sister (who got married and an earning husband)than his wife?  

please give your valid oppinion.may allah bless you&may your every good wishes come true.
Praise be to Allah.Firstly: 
The relationship between a man and his family 
    should not get in the way of his relationship with his wife and children. The smart wife is the one who is keen for her husband to develop a 
    strong relationship with his own family and for there to be friendship and love between them. She should not be an obstacle in the way of the 
    happiness of her husband’s family. 
The smart wife is wise in her dealings if she 
    sees some shortcomings in the way he treats his children and wife, and she is wise if she sees him exaggerating in his concern for his family at 
    the expense of his wife and children. So she makes him aware of his mistake by hinting, not by stating it bluntly, and she advises him without 
    hurting his feelings, and shows him the right way without making him feel that he is wrong, letting him feel that she loves his family and cares 
    for them. 
A woman should not think that her husband’s 
    care for his family will make him fall short in his duties towards her and his children. There is a difference between a husband falling short in 
    his duties towards his wife and children and his loving his family. What makes a man care for his family is his love for them, not his negligence 
    towards his wife and children. 
Secondly: 
Your husband has rights and you have duties. 
    Each of you should do that which is enjoined upon him or her by sharee’ah. Sharee’ah cannot make a man stop loving his family because he has got 
    married, and we cannot ask him to suppress his feelings for the sake of his wife and children. They were his family before he got married and they 
    will remain his family after he gets married. 
You have to try hard to deal with your own 
    feelings, and advise your husband when he falls short in his duties towards you and his children. You do not have the right to denounce him for 
    his love for his sister or his family. There is the fear in such situations that the man will say, “I can find a thousand wives but I cannot find 
    another brother or sister.” So beware of making the matter reach that state. 
At the same time we advise the husband to be 
    pay attention to his wife’s feelings and to take care of his wife and children. We also advise the sister to give her brother similar advice. 
Islam enjoins doing that which is in the 
    interests of all concerned, so that they may share in building the family, not destroying it. All of us must do the duties that Allaah has 
    enjoined upon us, without exaggeration or neglect. 
And Allaah is the Guide to the straight path.