No, I think that is not right. Rhea Mae is kaver's and Mariah's daughter and jemison is Archer's son or daughter. Archer is Mariahs grandson but they are not first cousins. Archer came from offspring of Mariah and Cabot Sirroca, yes?
I think about this stuff but I don't really care much. Just wnt the birds to stay safe
You're right, not first cousins, but whatever degree of cousin-ness it is. Freedom (Archer's father) & Rhea Mae are full siblings, both offspring of M&K. So, in human terms, Rhea Mae is Archer's aunt...therefore all their offspring are cousins.
And no, it doesn't matter at all...just that margaret commented that they looked alike in their carriers and was checking that they are related...