他家里有四口人翻译为There are four people in his family.
Family：
1、n.家；家庭；家族；家属；子女；亲属；氏族；语族；犯罪家族；犯罪团伙。
2、adj.老少咸宜的。
3、复数：families。
4、短语搭配。
family member家庭成员；家族成员；家人。
royal family皇室；皇家。
family name姓氏。
family history家族史；家庭史；家族历史。
poor family贫穷的家庭；穷家庭。
host family主人家庭；寄宿家庭；接待家庭。
family farm家庭农场；家族农场；家庭农庄。
family dinner家庭晚餐；家庭晚宴；家庭宴会。
family instructions家训。
family planning计划生育；人工避孕。
affluent family富裕的家庭。
family members家庭成员；家属；家人。
family business家族业务；家族企业；家庭生意。
large family大家族。
双语例句：
1、He had to keep his large family in the manner he had chosen.
他不得不以他所选择的方式养活他的一大家子人。
2、[with clause]Charles reflected that maybe there was hope for the family after all.
查尔斯考虑也许这个家还有希望。
3、The recipe book has little asides about the importance of home and family.
这本食谱很少有关于家庭生活和家人重要性的题外话。
4、Those who put work before their family life often live to regret it.
把工作看得比家庭重的人常常追悔莫及。
5、The effects of family and kinship relations on the construction of sexed individuals.
家庭与亲属关系对有性特征个人结构的影响。
6、The family is usually a source of encouragement from which affirmative influences come.
家庭通常是鼓励的源泉，能给予家庭成员积极的影响。
7、Some would say bringing up a family was a full-time job in itself.
有人说养儿育女本身就等于一份全职工作。
8、The family came to be seen as a refuge from a harsh world.
家庭被看成是躲避残酷世界的地方。
9、If the captain has a family or any absorbing concernment of that sort.
如果船长有家庭或是任何那种令他关心牵挂的事。
10、Sunlight streamed down through stained glass, irradiating the faces of family and friends.
阳光穿过彩色玻璃照了进来，使家人和朋友的脸容光焕发。