User registration without email address OR registration with pseudo-email address

I am programmatically creating users for the roles Parent (Adult) & Child (minor). During registration, minors (Children) typically will not have email addresses but Drupal user registration requires email address.

During registration of minor, unfortunately, the adults email address cannot be reused based on Drupal’s one email rule.

My queries are as follows:

1. Is it possible that we can create users without email address?
2. If not 1. can we use some pseudo-email address that we can created for each minor. However, emails for any minor should be sent to the adults address instead.