Folly De Die Natali, a Study in Determinism or Don't Trust the 'Must' (completed on Die Non-Natali, i.e., the poet's unbirthday)

Here's not Paul Atreides 

nor not Warren Beattys, 

Elizabeth Cadys 

nor do, dare, dedis...

"In eighty days, Adie turns eighty":
six words which must, someday, prove true.*

(And, in some way or t'other, young Adie's big brother
Sebastian must turn eighty-two.)

     ** That day will be May 26th in the year 2083. 

Mark your calendars.

But must they, too, migrate to Haiti,

a decision said sibs view as weighty...?
Must Adie get wedded to Katie,
an attractive and talented lady...

...whose mummy and dad are Kuwaiti...?
Must Seb bed a woman call'd Zadie

from the Philippine Island of Leyte*
who'd bear him a scion dubb'd Brady...?

Must Adie 'n' Kate beget Grady 'n' Nate,

conjoin'd twins, in a nascency shady...?

I can't ensure those outcomes, matey,

since by then I'll've said "When." (As will you.)

     * Pronounced by some (Latinex...?) as 

/Lay tay/ but here enunciated to rhyme with 

Zadie (a perfectly acceptable -- if perhaps 

overly venerable -- pronunciation).