I've got nothing for relationships, but here are four great parenting books by two very good economists. These aren't just great books about parenting, they're amongst my favorite economics books.

Bryan Caplan Selfish Reasons to Have More Kids The main thesis of this book is that parents are killing themselves trying to be perfect when they can actually enjoy themselves and have fun with their kids. The conclusions are drawn from fascinating research on twins that allows for teasing out the role of parenting vs genetics in children's outcomes.

Emily Oster Emily's three books (linked above) are an empirical assessment of specific parenting practices. Largely consistent with Caplan's work, some practices really do seem to have statistically significant effects, but in general the importance of those practices has been greatly inflated by poorly designed studies.

Child psychologist here...

For Parenting:

I recommend the books by Dr. Gold. She has been well trained in the field of parenting and the psychology of children and families.

"The Power of Discord" https://www.claudiamgoldmd.com/the-power-of-discord/

"Keeping Your Child in Mind" https://www.claudiamgoldmd.com/the-power-of-discord/

A more technical book "The Developmental Science of Early Childhood" https://www.claudiamgoldmd.com/the-developmental-science-of-early-childhood/

Also, Dr. Fonagy's work on "mentalization" : https://psychoanalysis.org.uk/our-authors-and-theorists/peter-fonagy

And Dr. Bolwby's work on Attachment Theory : https://www.verywellmind.com/john-bowlby-biography-1907-1990-2795514

For Relationships:

I recommend the book "Hold Me Tight" by Dr. Johnson: https://drsuejohnson.com/books/ She has done great work in the field of adult relationships.

Also, I recommend the works of Dr. Gottman. A good book by him is "The Seven Principles for Making Marriage Work" : https://www.gottman.com/product/the-seven-principles-for-making-marriage-work/

All these authors above give great insight into the dynamics of the relational bond between our children and our loved ones. It is the bonds between us that carry the most salient energy for thriving as children and adults.

Last but not least, I highly recommend Mark Passio's work on Natural Law. As we can only thrive psychologically if we Truly know the difference between a right and wrong and then we need to teach it to our children. https://odysee.com/@woeih:e/Mark-Passio-Natural-Law-Seminar-Part-1-of-3-2013-10-19:c

I highly recommend the book 1-2-3 Magic for help with rule-setting with younger kids. It's short, succinct, straight-forward, respectful to kids and parents, and just WORKS.

Kids can be whiny, unhappy, entitled brats, or fun little humans that you enjoy spending time with. A lot depends on how you interact with them, and - importantly - how consistent you are with that.

I remember seeing once, in a big box store, a little girl having a tantrum with her dad over a trinket. The dad held out for about 10 minutes, and then gave in, and purchased the trinket. There is NOTHING that will incentivize bad behavior more than situations like this.

Real-time Relationships, and Peaceful Parenting by Stefan Molyneux. Both very thought-provoking.

The former is for free, but can also be purchased on amazon too (kindle), the latter is only available in audio format for supporters, but you can get a promo code and have unlimited access for one months and get everything for free. https://freedomain.locals.com/

Dostoevsky :)

One more I forgot...

Love & Respect: The Love She Most Desires; The Respect He Desperately Needs by Emerson Eggerichs

Congrats on wanting to get educated before making important decisions.

I recommend "We Need to Talk: How to Have Conversations that Matter", by Celeste Headlee.

The 5 Love Languages by Gary Chapman

Men Are Like Waffles--Women Are Like Spaghetti: Understanding and Delighting in Your Differences by Bill and Pam Farrel