Tammy knew.

"Avery, why didn't you tell Elliot? If he finds out that these are his kids…"

"He doesn't want kids, Tammy. If you tell this to anyone or even Elliot, we won't be friends anymore." Avery said with a cold voice and her face was even colder as if she was a whole different person.

"If this is serious, of course I won't tell. This is your privacy and I will keep your secret." Tammy said anxiously, "I really don't understand Elliot. What do you think, does he have a mental problem?"