पर्यावरण अध्ययन What is meant by nuclear family?

 पर्यावरण अध्ययन in english,  परिवार  family consisting of parents and their children question answers in english pdf  Entire family including children, their parents and grandparents questions in english, Know About Family formed after the year 1950 पर्यावरण अध्ययन online test पर्यावरण अध्ययन MCQS Online Coaching in english quiz book    husband and wife only