In general, property law is state law. There are a few exceptions and one of them is Spousal Consent to change a beneficiary on qualified plans.
Estate planning aims at the transfer of wealth from one generation to another in a way which minimizes taxes and maximizes economic gain. It usually involves parents making gifts to their children, grandchildren, or charities. The problem is that while many clients spend hours with attorneys, accountants, and financial advisors crafting an estate plan, they spend no time with their intended beneficiaries explaining what they have done and why. After mom and dad are gone, the family acrimony begins - brother sues brother and sisters stop talking to one another for years.