I'm wondering what would happen if you'd send a GDPR request for deletion of personal data to such a DNA sequencing company. While you might not have sent them

I'm wondering what would happen if you'd send a GDPR request for deletion of personal data to such a DNA sequencing company. While you might not have sent them any of your DNA, relatives of you might have sent them theirs. Since DNA material can also be used to infer characteristics from close relatives, would DNA material of close relatives be considered personal data falling under the rules of GDPR?