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Nuclear family mainly consists of a small family of parents & their children whereas Joint family means a big family consisting of grandparents, uncle, aunts, cousins, etc.
Both have their own advantage & disadvantages.
i) Nuclear family has less domestic work whereas joint family is just the reverse of it.
ii) Joint family teaches the idea of sharing & respect as the children are under the guidance of elderly people but in Nuclear family the children are taken care by either parents ( who are not even able to devote quality time to them) & maids.
iii) In Joint family has a great impact on the children who remain well protected whereas in Nuclear family this is not possible.
Nuclear family -the first reason is that in this family everyone feels very  lonely.                          
            but only there is your parents ,brothers and sisters so i think it  is more comfortable. and its a small happy family.
joint family - there are everyone ready to help you any time and live with                           happiness and take care of everyone so it also increase love among all as everyone is living with all under one shelter.
                    but it may sometimes not good as there are so many peoples                      so their are some misunderstandings .
hope it helps :D
Nice :)
urs awesome