I Found A Way to Do It!
I have attempted for a day and a half to figure out how to connect my Sim, Joseph, Sr., to the family I had generated off of him; his parents and four siblings. I kept failing, but today I rose more determined to try again. I read a couple of articles that in many ways contradicted each other on just how to go about it. I, for a certainty, didn't wish for Joseph's heritage to be fraudulent in any way.
So, with a prayer and a hope in my heart, I placed the Cantrell's you know into a house in Del Sol Valley, for now, and the Aaron the First, his wife and Queen Juliana and their five children (after I removed a second daughter), I had Aaron create his dynasty, making Joseph Sr., his heir, of course, and then I sent the real Joseph, as in Erik's father, over to the castle in Belforde. I used MCCC to create a relationship between this original Joseph and Aaron the First. Then I realized I'd forgotten to make the link with his mother. Quickly, I fixed that. Then after switching households, I deleted the generated Joseph. Then I checked original Joseph's relationships before I sent him home.
It WORKED. He's got his parents. I removed the generated Joseph, and the original one is still listed on the tree as a son of Aaron and Juliana!
I am over the moon right now. Not sticking around, however, as I still have a little bit of time to play before I head on over to my son's house for dinner! I just wanted to share this news in case others are struggling.
Happy Simming!
~GalacticGal