MARK KOHLERMain Street Professionals, Main Street Professionals, Main Street Professionals, Main Street Professionals, Main Street Professionals, LLC · Owner at Main Street Professionals, LLC

Even Family Members Should Sign Your Service Agreement

7 Feb 2026 · 0 min

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0:24

In this brief YouTube clip, Mark Kohler warns service providers that even when dealing with family members, a formal service agreement is essential. He emphasizes that a good customer can become a bad one, and without a signed contract, disputes can damage both the business and personal relationships. While he humorously suggests that a mother might be an exception, his core message is that everyone else—especially relatives like a brother‑in‑law—should sign a contract before services are rendered to protect both parties and preserve the relationship.

You never know when a good customer can turn into a bad customer. And sometimes we can get very selective on who we have sign agreements. Oh, this is my brother in law. Oh, he'll be fine. You're going to provide services to a family member, you better damn well have a contract. So my point or message here is everybody has to sign your agreement. Maybe your mom doesn't, but that's probably where I draw the line. Everybody else has got to sign this contract because you never know when it can get ugly. And actually you're preserving a relationship.