Depicts a sexual relationship between brother and sister, who are not blood-related, but whose parents have been married since the children were about 10 - 12 years old. An estranged brother and sister begin an intense sexual relationship, behind the curtain of their otherwise normal working-class lives. A 13-year-old boy was booked for allegedly raping and impregnating his 15-year-old sister in Mumbai on Sunday. The police were notified about the case after the Vashi General Hospital reported a medico legal case (MLC) when the parents visited the hospital to terminate their daughter’s three-month ... Sibling sexual behaviour means any type of sexual behaviour between siblings. This can include: Sexual interactions that might be expected or appropriate for the child’s stage of development – it might be behaviour between young siblings and include curiosity or comfort seeking behaviours.