I'm assuming you mean that the work (baptism?) must be submitted by a descendent. Please correct me if I got that wrong.
Paraphrased from a prior post. Anne Frank died before she had children. She has no descendents. Therefore your statement concerning who initiates this work is not universally true.
She has no direct descendents. However, she most likely had a sister, brother, aunt, uncle, cousin, or something who is an ancestor of a Mormon.
And I'm not saying that names have not been submitted in the past by someone who is not related. It is now discouraged. I do know that one of the Prophets did the work for the Founding Fathers to ensure that they had their work done - kind of let them cut in line due to the service they rendered in founding this nation.