The human genome has been completely mastered and understood by the end of this century, which has led to a service industry revolving around genetic codes. Gene editing to prevent diseases are now possible, as well as linking the use of technologies to a specific genetic structure for security purposes. A business of gene splicing is also possible, in which a person can buy the code of another individual to incorporate into their offspring. Renowned people, such as celebrities and other popular individuals, sell their genetic code to the market for the masses to purchase. Want a little of Kim Kardashian's DNA in your daughter, or have your son inherit Barack Obama's charisma and good looks, their code can be purchased for a 'reasonable' fee in which they get a cut of the proceeds.
The technology has gotten to the point where a simple skin sample can be taken from a person in order to recreate their genetic structure. There is an underground black market for DNA in which samples are taken from people without permission. Wealthy people are specifically targeted for this crime. A rich individual could simply be cut by a knife to have their DNA stolen and redistributed. This posses a problem. Long lost brothers or forgotten bastard children can come out of the woodwork, legally able to claim an inheritance from their rich family due to a nation's laws. Royal lineages would be forced to accept them into the family tree, making it possible to claim a kingdom. Gene linked tech such as safes or checking accounts linked to families could be accessed, making their money vulnerable. This stolen DNA can be propagated within society by children who have them, leading to a bunch of people walking around with illegal DNA.
Banning this tech is not possible, as there is too much money being made to close the box of Pandora. Simply killing people who have illegal DNA within them would never make it pass government oversight. However, the rich need to protect their generational wealth so it can be transferred to the next generation. As such, they need to protect the exclusivity of their genetic structure. How can the 1% prevent their DNA from being propagated?