Blueface‘s mother has made a bombshell claim — suggesting her son and his new baby mama, Chrisean Rock, are actually related … although it’s hard to tell exactly how.

The rapper’s mom, Karlissa Saffold, made the allegation on social media over the weekend — not long after Chrisean gave birth to her and Blueface’s newborn baby boy. She says Blueface and Chrisean could possibly be cousins — in fact, she totally believes it.

Check out her rationale for yourself … Karlissa seems to believe there’s a bloodline connection in the surname of Chrisean’s own mother — which is apparently Dorsey. Karlissa says there are Dorseys in her own family as well … but doesn’t explain who has that last name in her family. Obviously, she doesn’t have that last name … nor does Blue himself.

Again, we have no idea who the “Dorsey” in her brood is … but Karlissa insists all Dorseys are connected, and that they all act the way Chrisean does — with strong personalities, etc.

Clearly, this isn’t exactly science … it’s literally just a theory Karlissa’s floating, without much hard evidence to back it up — let alone a proper explanation … and yet, it’s disturbing.

She half-jokingly says they need to have the baby’s DNA tested to find out for sure … but it sounds like she’s already convinced. In her mind, her son did some inbreeding in the family.