Alvin P. Carter
I noticed you set all the Carter Family relations, but there is something to correct/integrate. I'll try to make it as short as possible, starting from A.P.:
Family: Carter Sisters Well, they were a group, I don't know if they could be considered "family"...
Janette Carter Daughter OK
Carlene Carter OK
Anita Carter niece/uncle
June Carter niece/uncle
The Carter Family:
Janette Carter wasn't a member of the (original) Carter Family.
Janette Carter:
Anita and June were both first and second cousins of Janette's: their mothers (Sara and Maybelle) were cousins, but their fathers (A.P. and Ezra) were brothers... So I suggest removing the "second" in "second cousin".