Consider this scenario from The Golden Scribe's Prenuptial Agreements to Protect the Family :
In a similar fashion, business partners can be protected with a prenuptial agreement. If Tom and Scott have worked over the past five years to create a successful business, and Tom is about to get married, the business and its assets can be protected by the prenuptial agreement. This not only protects Tom, but it protects Scott, as well. Without a prenuptial agreement, Tom and Scott’s business could potentially be torn apart by a divorce.
Oh, what if everyone is married before starting the business? Think about a post-nuptial agreement.