  In this talk, given at Corfu 2022 Workshop on the Standard Model and Beyond,
I present work in collaboration with Junichiro
Kawamura,Ref.~[arXiv:2212.00840]. The talk is also based on a number of papers
on a Global $SU(5)$ F-theory GUT in collaboration with Herb Clemens. In the
model $SU(5)$ is broken to the MSSM via a Wilson line. This is accomplished
(without problems with vector-like exotics) by simultaneously describing the
F-theory model and its Heterotic dual. The model has a twin MSSM sector and
it's the neutrino sector of the field I consider in the talk.
