share posts between blogs

My wife and I have separate self hosted wordpress blogs as well as one for our family. I would like to have the “family” blog pull posts from our individual blogs and republish them. Ideally, I would like this to automatic and for posts only under a specific category.
Is there a plugin for this?
I’m looking at the sourcedfrom plugin but looks like it will repost all posts?

Thanks

Chris

twostorks.com/blog