how to use a different domain/subdomain for authors/catagories on single site?

I'm not sure if I phrased this question correctly...

My wife and I have one blog, family.com in this example, that we both contribute to.

I would like family.com to show all blog posts.

me.family.com would show only posts I author and her.family.com would show only posts she authors. later, we will add kid1.family.com and so on...

further, sometimes she/I/we do projects that grow beyond one post. project1.com would show only all posts in the 'project1' category. However, unlike authors, only specific categories would have their own domain names.

I've read far and wide but have only found discussions on multisite or multidomain. I don't think multisite is the answer and every plugin I've found seems to have been discontinued over a year ago. Is there a method or possibly even a plugin that would help in this case?