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Terms of use.
The fine print, in plain English.

Last updated: October 27, 2026

The short version

  • Everything here is informational. It isn't medical, genetic-counseling or legal advice, and the DNA check isn't a paternity or legal test.
  • Only compare DNA with permission. Use your own file, and someone else's only if they've agreed.
  • Results are estimates. DNA sharing overlaps between relationships, so we show the most likely options.
  • You must be 18 or older to use the relatedness check or join the list.

These terms are an agreement between you and Lotusbud LLC ("we", "us") about your use of DontMarryYourBro.com, its free tools and the relatedness check (together, the "site"). Our privacy policy explains how we handle information.

Agreeing

By using the site you agree to these terms. If you don't agree, please don't use it.

Who can use the site

You must be at least 18 years old to use the relatedness check, request a carrier check or join the early-access list. You're responsible for making sure using the site is legal where you live.

Not medical or legal advice

The site, its tools, articles and results are for general information and entertainment. They aren't medical advice, a diagnosis, genetic counseling or legal advice, and they don't create a doctor-patient or attorney-client relationship. Talk to a doctor or genetic counselor about health or family planning, and to a lawyer about marriage law in your state or country.

The relatedness check is not a paternity, maternity or legal DNA test. It can't be used for court, immigration, inheritance or any other legal purpose.

The relatedness check

The check compares two raw DNA files in your browser and estimates how much DNA they share and what relationships that amount is consistent with. Your files aren't uploaded to us. You're responsible for the files you choose and for keeping your device and any results secure.

The check is free while in beta. We may change it, start charging for it, or stop offering it. If we charge in the future, we'll show the price and any extra terms before you pay.

You may only compare a DNA file that belongs to you, or to someone who has clearly agreed to the comparison. Don't use the site to test anyone without their knowledge, including a partner, family member or child. DNA results can reveal unexpected family information, such as unknown parentage or relatives. Please think about that, and about the people involved, before you run a check.

Accuracy

We work hard to make the check and our tools accurate, but DNA inheritance is random and relationships overlap. Results are estimates and can be wrong, especially when files have few markers in common, contain errors, or come from people with many shared ancestors, for example in communities where marriage between relatives has been common. Shared cM averages and ranges come from published research and may not fit every family.

Free tools and information

Our calculators, charts, articles and state-by-state law summaries are provided as is. Laws change, and our summaries may be out of date or incomplete. Check the current law with your local marriage authority or a lawyer before relying on it. Grandma's compatibility test is for entertainment only.

Carrier check requests

Requesting a carrier check is free and isn't an order. Nothing is charged when you request one. We'll email you the options, pricing and next steps available for your region, and you decide whether to go ahead. Availability, labs, prices and timing vary by country, and in some regions we may not be able to offer a test.

If you go ahead, the test is ordered by a licensed physician and performed by a certified laboratory under their own terms, which you'll see and accept before paying. Only add your partner's details if they've agreed to be contacted.

Joining the early-access list is a request for updates. It isn't an order or a reservation.

Affiliate links

Some links to DNA testing companies are affiliate links, and we may earn a commission if you buy through them, at no extra cost to you. Those companies' products, prices and terms are their own responsibility. See our affiliate disclosure.

What you can't do

  • Use the site to analyze anyone's DNA without their consent, or to harass, embarrass or harm anyone.
  • Use the site for anything illegal, or present our results as a legal or medical test.
  • Interfere with the site, overload it, or try to access parts of it you aren't meant to, such as private pages.
  • Copy large parts of the site's content to republish it, or scrape it with automated tools beyond normal search-engine indexing.

Our content

The site's design, text, graphics, name and logo belong to Lotusbud LLC or our licensors. You're welcome to share links, quote small parts with credit, and share your own results. Data from the Shared cM Project is used under its Creative Commons license.

No warranties

The site is provided "as is" and "as available", without warranties of any kind, whether express or implied, including warranties of accuracy, fitness for a particular purpose and non-infringement, to the fullest extent the law allows.

Limits on liability

To the fullest extent the law allows, Lotusbud LLC won't be liable for any indirect, incidental, special, consequential or punitive damages, or for decisions you make based on the site or its results, including decisions about relationships, marriage or family planning. Our total liability for any claim related to the site is limited to the greater of the amount you paid us in the 12 months before the claim or $100. Some places don't allow these limits, so they may not all apply to you.

Indemnity

If you misuse the site or break these terms, for example by analyzing someone's DNA without their consent, you agree to cover the reasonable costs and losses that causes us, including legal fees.

Governing law

These terms are governed by the laws of the State of Wyoming, without regard to conflict-of-law rules. Any dispute will be handled in the state or federal courts located there, unless the law where you live gives you the right to bring it elsewhere.

Changes

We may update these terms. We'll change the date at the top, and if a change is significant, we'll point it out on the site. Using the site after a change means you accept the new terms.

Contact

Lotusbud LLC · founder@dontmarryyourbro.com