Creating Comcast.net email address for family members

Been with Comcast for 25+ years.  When my kids were younger, I was able to give them a Comcast.net email address set up through my account. I believe I had the ability to have 5 or so different emails back then.

We now have 2 grandkids who stay with us very regularly. I wanted to create a Comcast.net email for them.  But I have not idea how to do it.  The knowledge base does not seem to have instructions on how to do it.

Can someone help?