Lekh Tandon's Agar Tum Na Hote is an interesting, pleasant watch. The story must have been told many times, but I would mention that it involves many noteworthy points. It is about the difficulty of bringing up a child all alone without a wife, about sacrifice and dedication to a spouse, and about the pain of crippled people. This entertaining film shows the more chilled out side of Indian cinema, it flows very well, and never makes you want to fast it forward. Apart from its many great moments, it is particularly benefited by a fantastic soundtrack by maestro R.D. Burman. Two songs which stand out are the soulful "Agar Tum Na Hote", performed by Kishore Kumar and Lata Mangeshkar in two different versions, and especially "Dheere Dheere", a rather sensuous number which is perfectly performed by Asha Bhosle.
Of the three leading stars, the one who impresses most is unsurprisingly the ever enigmatic Rekha. The film revolves quite around her character(s), and she is amazingly compelling, likable and restrained all through. Whether she is an honest and intelligent young woman, a dedicated and suffering wife, or a loving governess, she exudes warmth and kindness and makes the character truthful and believable. The two costars are less convincing. Rajesh Khanna plays a smart and sharp businessman, but I personally don't think he is a great choice for the role because despite the good actor that he is considered to be, he is for the most part very unnatural. Raj Babbar in quite a good role is not consistently good and at times overacts, but still he is effective enough. And the girl! Oh boy was she annoying.
I recommend you to watch Agar Tum Na Hote. It's a good Hindi 1980s film. As it goes by, it becomes more intense and interesting and the ending is both heart-warming and saddening.