Note
I'm assuming this yellow note is written by one of Jean Ellen's daughters, which is why Lennie is referred to as Grandma.
Carrie did have a daughter named Helen Harper, but the geneology ends there, I'm not sure if Helen Harper had any children.
Though Helen Harper would be Lennie's niece, so if Helen had any daughters, they would be Lennie's grandnieces, not granddaughters.
More information is needed for this to make sense.
-Delaina Soboloski