<prompt> The following is true about the term New familiesIt is a variant of the 3 - generation familyIt is applied to all nuclear families of less than 10 years durationIt is a variant of joint familyIt is applied to all nuclear families of less than 2 years duration  <response>: Te term new families has come recently into vogue ,it is applied to those under 10 years duration and consists of parents and children. Ref:p.740 25 th edition Parks Textbook of Preventive and Social Medicine 