As the pups get older, we allow the other adults to help socialize them. Many ask why we don't do this early on.
Moms are usually very protective over their crew when they are vulnerable and rightly so. But as the moms see they are able to handle themselves, then she stands back and lets the others help her teach them manners, how to play and much more.
It's wonderful having more helping paws.
Wouldn't you have liked that when your kids were small? I know I would have especially without the complications that humans would have.