+100000000.......
Way too many families have been ripped apart by arguments over inheritance.
Fights happen even when inheritance is modest. The more assets are involved, the more potential for fights.
Even very smart business people find it hard to deal with this, or just procrastinate. The situation is worse if there's a family business and some of the kids are involved. There are many potential solutions that can keep everyone happy, but step number one is to acknowledge that a huge problem potentially exists, and having the urgency to deal with it.
One of the most heartbreaking stories I am aware of is of a person I knew who dies suddenly and unexpectedly in his 70s. He went to a Madison Avenue law firm to draft his will, but when every minute with the attorney (who is in no rush to let you go, because the attorney wants to do a proper job, which requires a lot of probing) costs you $10 (and additional billing by the attorney to draft documents when you're not sitting in front of him), many people will eventually cut corners. In this specific case AFAIK the family is still fighting, and the value of the estate has suffered.