I did not say Frank and Jesse had no living descendants!!!!!
I said all their descendants had other names than James.

Jesse had 1 son and 1 daughter. His son married had 5 girls. When they married they all took their husbands last
name.

Frank had 1 son and 1 daughter. His son was childless.

The book I got my information from was co-authored by one of Jesse's grandsons and one of his great grandsons.