Weird condition or something ..?

Corazon <333

New member
The other day my mom was conversing to her friend about how my younger sister and I had been born with something in our blood that didn't allow us to have children with all different types of blood types . I tried asking her what it was called and tried asking for more information but she wouldn't tell me . Do you probably have a name for this and information . ? 10 points for the clearest answer .
 
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