one-parent family meaning in Chinese

单亲家庭

As a special group in school , students of one - parent family always get more psychological illness than they from typical family
单亲家庭学生作为学校的一个特殊群体，较正常学生更容易产生一些心理问题。不知道怎么写呢，这样的话该怎么改呢？
2 . in two - parent family , non - only children were found to have better self - concept than only children . however , in one - parent family , there was no difference in self - concept between only children and non - only children
二、完整家庭的非独生子女自我概念平均值高于独生子女自我概念平均值；而不完整家庭中，非独生子女与独生子女自我概念平均值并无显著差异。