This is a self-guided book on the therapeutic process known as “Family Systems Theory.” It can be helpful in bringing up and walking you through extended family issues.
The Enneagram is more than a personality test, it is a way of self-knowing that can help not only with self-awareness but in understanding others. While it is very old (dating to pre-modern times) it continues to be used today in religious and non-religious settings including work, marriage, and leadership development.
Here’s a list of books in order that you might consider picking them up. The first is a very simple and easy introduction and it goes deeper from there.