I've had a look and you may want to check out the following files;
root/lib/components/com_users/models/remind.php
and
root/lib/components/com_users/models/reset.php
You should be able to add your own email in as a CC there, with something like
$mailer->addCC("carboncopy@yourdomain.com")
Although according to the official documentation if there are multiple recipients, you would put each recipient's email address in an array, as below;
$recipient = array( 'person1@domain.com', 'person2@domain.com', 'person3@domain.com' );
$mailer->addRecipient($recipient);
The official documentation shows you how to send an email from a component.
I must say I haven't had the chance to try this although I can't imagine it's very difficult, perhaps somebody else can help you with the rest of the code?
Hopefully this points you in the right direction.