Listen to books of love letters. I forget the title but one of the Bush twins wrote a book about her grandparents (George and Barbara). Stories about real love, real life. Fiction is great too but having a real world examples of happy partnerships is gold.
The thing about behavior is that if you practice you get better. That goes for good behavior and bad behavior. The more you lie, cheat, etc. the better u get. Decide What kind of behavior you want to be good at and then practice practice
Celebration and acknowledgment: Make a big deal over little-big things and teach them the same: getting their braces off, or a cast on a broken bone, a friend gets a new car, etc. Always acknowledge the sad that someone is going through or the difficult situation. Applies to all ages.
Always clean from clean to dirty. Wash glassware first, greasy dishes last. Sink and tub first, then toilet. Then floor. Top-to bottom is another general rule.
To avoid miscommunication and misplaced expectations, tell your partner what you need from them. But if what you need is for them to be a different person, that’s not fair to them or to you. Let them go and set about finding the right person.
Notre Dame Lullabies by the O’Neil Brothers is my favorite album ever. I used to play it at your bedtime when u were a baby and even sometimes when you were a kid. It reminds me of the happiest time of my life, when you came into it. Play it for me when I’m old and gray, okay?
Teach your pets they can trust you. Take care of them. Treat them with tenderness. Teach them how to behave. (Unless it's a cat. You can't teach cats anything.)
If you’re ever in a situation where you’re worried you might need people to believe you in the future, take contemporaneous notes. Write or record what happened, how you responded. Focus on the facts but don’t ignore your thoughts or feelings, include them in your notes. Date and sign it. Keep it safe.
Check out fencing. Local fencing club has classes for kids and adults all ages. They also do birthday parties, so that might be something different that would be fun for him and his friends.