Family experiences are key
Business families often have a number of family members who end up spending lots of time together, along with other members who, by virtue of having a job outside the family business and/or geography, seem to be less involved in what we might call family "camaraderie".
For these families, it becomes even more important to proactively find opportunities for everyone to spend some quality time together. I'm not just talking about getting together to talk about business, either. Finding ways for family members to experience things together, hopefully unrelated to the business, can be the key to maintaining healthy relationships.
While it may be hard to put a monetary value on creating a family that enjoys each others' company, it is one of those things that can become obvious when it is absent! You don't want to be one of those families.
Every family will eventually come to some important inflection points, and that's when their ability to get along will be tested. If they've spent lots of time together during the good times, the tougher times will be easier to face together.