I am disagree if backstreet from parents is not a relationship. Although I am never experience the backstreet. Backstreet is a relationship only relation that plaited get not allowed from parents. For me if couples did backstreet, it is better they honest from their parents. Explain about their feel of their couples, and explain too about their couples identity. If their parents fixed not blessed. It is better that couples separated in good way, because for me, the best from parents, certainly the best from Allah swt too.