In the UK GDPR ‘personal data’ is defined as:
‘personal data’ means any information relating to an identified or identifiable natural person (‘data subject’); an identifiable natural person is one who can be identified, directly or indirectly, in particular by reference to an identifier such as a name, an identification number, location data, an online identifier or to one or more factors specific to the physical, physiological, genetic, mental, economic, cultural or social identity of that natural person.
Genetic information is shared to some extent by blood relatives. Therefore one person's genetic sequence is related to all their relatives. A person's genetic sequence can be used to identify their relatives, as shown in the case of the Golden State Killer Joseph James DeAngelo who was caught via their relatives genetic data in a commercial database.
It seems that one persons genetic sequence meets the requirements to be all their relatives personal data. Is this a correct interpretation?