Two fathers and two sons are in the same photo.How many people are there at least?

问题描述:

Two fathers and two sons are in the same photo.How many people are there at least?
翻译

两个父亲和两个儿子在同一张照片里,那么照片里一共有几个人?
上面是翻译~!答案是三个,孙子,儿子,父亲~!