If Beto O’Rouke were Jeb Bush’s illegitimate love child, it wouldn’t necessarily preclude Patrick O’Rourke from being GHWB’s illegitimate love child.
And that scenario would explain Beto’s closeness in appearance to Patrick, if Beto were really Jeb’s son.
These things get hidden well. Think of Danney Williams (Clinton) or Chelsea Clinton (Hubbell).
By the way, I wonder what bitter Jeb is up to today?
“Jeb Bush: Trump's 'unilateralism' on foreign policy is 'really dangerous'”
https://thehill.com/homenews/campaign/434392-jeb-bush-trumps-unilateralism-on-foreign-policy-is-really-dangerous