Is it grammatically correct to say two twins?

It's not grammatically incorrect to say "two twins," but it's a bit redundant.

Here's why:

* Twin already implies two people.

* Saying "two twins" is like saying "two couples" or "two pairs." It's understood that "twins" means a pair.

Here are some better alternatives:

* The twins

* Both twins

* A pair of twins

You can use "two twins" if you want to emphasize the number, but it's usually unnecessary.