The term "unrelated" refers to having no familial or genealogical connection. It describes individuals who are not related by blood, marriage, or adoption and have no common ancestors. In other words, they are not part of the same family tree.
Instead they created a series of unrelated events sharing a central design. (kotaku.com)
Many business owners learn to become successful entrepreneurs by paying attention to others — even if they are in completely unrelated fields. (commercialcapitaltraining.com)
The «bright line» rule does not apply in unrelated matters where «it is unreasonable for a client to expect that its law firm will not act against it». (slaw.ca)