Her sister is friends with a homosexual man (we seek refuge with Allah)
Question

My sister has recently disturbed me in the last couple of months. I started to search for a lot of truth with my life, so I tried to learn more about Islam and I am succeeding.(Alhamdullilah)I have also stopped watching television which has helped clear my head in a tremondous way, It's been I would say about 5 months since I didn't watch. She has this homosexual friend and she thinks there's nothing wrong with him. I am horrified to say this, but she even went to a drag-queen show(homosexual bar with him.Iam extremely concerned with her because after having seen this her 'niya" is unclean.  She thinks there is nothing wrong with this type of people and in fact several of her classmates are of this nature and she associates with them.  I know my sister is not of this nature but living in Canada and especially watching television has corrupted her head. Because the kaafir's television tells us that this alright and all people should be excepted and welcomed, when this is notthe case or truth.Obviously by my question you can see my sister does not know a lot about Islam, What can I so? I'm generating my question around the fact that I live only with my mother and she said it was extremely difficult for her to take us to Quran when we came to the country and this might have saved us alot of turmoil. ( my mother and father are divorced and he lives very far away)
Praise be to Allah.Praise be to Allah Who has shown you the path of guidance; this is a great blessing which you must strive to maintain and give thanks to Allah for that.
With regard to the issue of your sister, it is important that you strive to call her to Islam and to influence her. Allah commanded His Prophet (peace and blessings of Allah be upon him) to start his call to Islam with his own tribe, as He said (interpretation of the meaning):
“And warn your tribe (O Muhammad) of near kindred”
[al-Shu’araa’ 26:214]
What you need to pay attention to here is the following: 
1-Pay attention to making du’aa’ for her, because du’aa’ has an effect by Allah’s leave. The Prophet (peace and blessings of Allah be upon him) prayed that some of those whom he was calling to Islam would be guided.
2-Be patient and don’t give up; what is not achieved today may be achieved tomorrow.
3-Use a variety of ways and means (of calling her).
4-Strive to choose appropriate times for da’wah, when your sister is more inclined to listen and respond.
5-Use some indirect methods, such as giving her some moving Islamic books or audio or video tapes, or leave some of them lying around in the house where she can find and use them.
6-Perhaps being related and being together for so long is an obstacle to her responding, so it may be a good idea to look for a religious friend of hers who likes her, and ask her to advise her and try to influence her. 
Shaykh Muhammad al-Duwaysh 
We ask Allah to guide your sister, and we advise you to give your sister the answer to Question no. 9465, on the ruling on forming friendships between the sexes, so that she can read it. See also the ruling on homosexuals in Islam, as given in Questions nos. 2104 and 6285.
This calamity which you are living through is a warning to you and to others of the dangers of living in the land of the kuffaar, and it is a motivation for Muslim men and women to return as quickly as possible to the lands of the Muslims.