Just a few ideas for guidelines/rules my wife and I have found helpful in our relationship

Set a standard for attire - My wife is expected to get up daily and get herself and the kids dressed. Generally she's expected to wear a dress and socks. The dress can be as fancy or a comfortable as she likes, the socks should be based around the temperature, warmer days =shorter socks.... colder days =longer socks. There are days especially right now she doesn't always get up and get dressed, she always gets the kids dressed but maybe not herself and stays in her nightie. It still meets the rules but let's her feel more comfortable, especially in days she's not feeling well (currently pregnant) so this happens often lately. I myself get up and get dressed daily as well, something nice and fitting for the weather. This helps to set am example for the kids of we get up and we get ready for the day, even if it's just relaxing inside.

Set time aside without screens - with raising the kids we have found screens while helpful at times often distracting. When the weather is nice we try to eat breakfast and dinner outside, when it's not we make sure to eat at the kitchen table without phones/tablets/etc. It may seem small but this forces conversations and often brings up questions from the kids about the most random things like a bird they hear in the background. Set the time aside from screens.

Guests - My wife and I have rules around guests. We request at least two hour notice before they visit, this helps to ensure the house is in order, that dinner will have enough food if they're coming for dinner. It eliminates surprises when I come home from work or her from the store. It just makes things flow better for us.

Calendar- We share a digital calendar that syncs with both of our phones. It make it easy to see when she has plans, when I work, when the kids have things going on so we can each see the others plans and adjust things as needed.