就这两个句子而言,What's the size of your family 是正确的,意思是 “你家规模有多大的”。这是针对四世同堂的旧式家庭而言的,含有多少口人的意思。如果对现代家庭提问,最好用下面的句子:
How many people are there in your family?
How many persons are there in your family?
都错了,应该是 How many people are there in your family ?
两句翻译都不对,应该是:
1、How many people are there in your family ?
2、How many members are there in your family ?
2吧