Chennai, March 6 (IANS) The sister of actor Dhanush says her family is undergoing a lot of agony over an elderly couple's claims that Dhanush is their long separated son.But Vimala Geetha says no matter what, the family is united and will fight the case. Dhanush was also upset after a few private pictures of his were leaked online.On Sunday, Vimala, a dentist by profession, wrote a moving Facebook post which was then deleted.She wrote: "For the past few months, our family is going through so much pain and agony because of various issues and we all kept quiet. We belong to a very poor family and one man with his hard work and sacrifice gave us food, education and everything we have now."From a small village in Theni to what we are now didn't come overnight or without sacrifice. My brother has faced criticism, embarrassment and insults to reach this level."She said Dhanush -- a popular film celebrity and son-in-law of megastar Rajinikanth -- achieved stardom through hard work and sacrifice."Success comes with a price I guess. Act of revenge in all ways possible and character assassination. Is this what an actor who tortures himself so much to entertain his fans and people of Tamil Nadu deserves?" she asked.Talking about how Twitter is being abused by some, she said: "Twitter has become a media where anyone can talk anything or post anything and it's disheartening to see cheap, fake porn videos on a platform where even a 12-year-old has accounts! And the worst thing is the number of people who ask for such perverted videos."She said her family will stay united. After writing the post, Vimala deactivated her Twitter account."Not in a state to talk to anyone or see anyone. Whoever is doing this, stop it. You cannot bring back someone if they go to the extent of killing themselves, particularly women. Please live and let live. God bless and goodbye for a while," she wrote.