Actress Mrunal Thakur has started following actor Dhanush's sisters, Karthika Krishnamoorthy and Vimala Geetha, on Instagram. This comes amid rumours that the actors are dating each other. In July, Mrunal was seen at a party with Dhanush and the cast and crew of his next 'Tere Ishk Mein'. Dhanush was earlier married to Rajinikanth's daughter Aishwarya Rajinikanth for 18 years.