She is taking care of her disabled brother and her parents want her to get married
Question

                I have a brother who is severely disabled and requires full time support and attention.  I am at an age at which my parents are concerned to get me married being a daughter and I understand their responsibility. 
However, I am very close to my brother and cannot bear to be separate from him.  
Also my main concern is that both my parents are not in the best of health and I know it will be very difficult to cope without me.  At the present time I cannot mentally accept getting married to anyone.  What can I do?
Praise be to Allah.You have done a good thing by taking care 
          of your brother; this is an act of kindness towards him and towards 
          your parents.  But marriage is a Sunnah, one of the ways of the 
          Prophets, which Allaah has prescribed for His slaves and He has created 
          them with an inclination towards it. I think that you have the choice 
          of a number of solutions, as follows: 
If you can afford to hire 
          someone to take care of your brother, this would be good. Or you could 
          look for some good people who would sponsor all or part of his care. 
          
Or you could get married and have your 
          brother come and live with you, so that you can carry on looking after 
          him. 
If you find someone who agrees to get 
          married on condition that you stay with your parents in order to take 
          care of your brother, and your husband comes to visit you in your house 
          or you go out to visit him sometimes, this may be a good idea. 
If none of these solutions 
          are easy for you, and you feel that delaying marriage will not cause 
          fitnah (temptation) for you, there is no sin on you in that case. But 
          if you fear that you will be subjected to fitnah, then it is better 
          for you to get married, because this will protect your religious commitment, 
          and serving your brother is not an obligation upon you, rather it is 
          voluntary good work.