I have three sons, One of them is (岁数）years old, and one of them is (岁数）years old, the last one is (岁数）years old， 你不需要说什么大儿子，二儿子和三儿子之类的，在美国没有用这种说法的，你直接告诉别人你的儿子几岁就可以了。
搞笑版的翻译（别学）： I have three sons, One of them is big, and One of them is "two", and the last one is small.
