Ishaan accepted that he has forgot his recent past and trusting his family, he is convinced that he bought a car sometime ago, Illesh got a job, everything is fine b/w Radha Bua and Deepak and he has started living with the Kashyaps. So why don't the Kashyaps tell him the truth about his marriage with Suhana??... I don't think Ishaan will deny the truth told by his family
Again.. even if they tell him the truth he'll not be able to remember Suhana or his marriage but at least he'll not behave awkwardly with Suhana/Shashikala as of now he is doing it..