First correct two misunderstandings upstairs.

1, it is impossible to have two children a year? Where are the twins?

My youngest son has red hair. This sentence shows that my youngest son is not a twin.

Three conditions can be drawn from Ivan's words.

1, the product of their ages is 36, and the possible arrangement is:

1 1 36 38

1 2 18 2 1

1 3 12 16

2 3 6 1 1

1 6 6 13

2 2 9 13

3 3 4 10

Their combined age happens to be today, Ivan began. You didn't tell me your son's age. "

According to this sentence, we can know that today's date is 13, because if the date is10116/21,then there is only one corresponding arrangement.

My youngest son has red hair. This sentence means that his youngest son is unique, so the result should be 1, 6, 6.