families是名词family的复数形式，表示家人的，家族。family表示家人的概念时一般都是不可数的，只能说a lot of family，不能说a lot of families。families一般表示多个家庭。
family和families有什么区别
families和family只有一个区别，就是词性不同。
1、families是名词family的复数形式，表示家人的，家族。
如：There was a blood feud between the two families.
这两个家族间有血仇。
2、family作名词意思有家庭；亲属；家族；子女；[生]科；语族；[化]族。作形容词意思有家庭的；家族的；适合于全家的。
如：There are five people in my family.
我家里有五口人。
family和families的例句
Family例句：
例句：Almost every family in the country owns a television.
这个国家几乎家家都有一台电视机。
All our family came to Grandad's eightieth birthday party.
我们所有的亲属都来参加了祖父八十寿宴。
I addressed it to Mr and Mrs Jones and family.
我以此致琼斯伉俪及子女。
Lions belong to the cat family.
狮属于猫科。
Families例句：
There was a blood feud between the two families.
这两个家族间有血仇。
Several rich families have propped up the regime.
几个富豪家族为那个政权撑腰。
Some families have farmed in this area for hundreds of years.
有些家族在这个地区务农有几百年了。