Which of the following description is correct?

A、Nuclear family is very commonly seen in the modern society. It includes all relatives with closest bond in a family, who will share their daily duties. ;
B、In a joint family, parents and children may share no blood bond and come from difference races or with different nationalities. ;
C、The families that are composed by couples who are forced to be childless are referred to as DINK.;
D、In a conjugal family, the kids may be the parents’ own children or their adopted children.