Seabook's and Reese's mother is an engineer in the employ of the military Strategic Naval Research Institute, and the designer of the bio-computer installed in the prototype F91 Gundam. Monica has essentially separated from her family in order to devote herself to her research work, and her children have deeply mixed feelings towards their absent mother.

(Source: The Gundam Wiki)

U.C. 0123. Mobile Suit Gundam F91 is Gundam creator Yoshiyuki Tomino's attempt to launch a new Gundam saga, set thirty years after Char's Counterattack. 
The story of Gundam F91 revolves around teenage space colonist Seabook Arno, his friend Cecily Fairchild, and the efforts of the Crossbone Vanguard militia, led by Cecily's grandfather Meitzer Ronah, to establish an aristocracy known as "Cosmo Babylonia". 
In keeping with Gundam tradition, the civilian Seabook is forced by circumstance to pilot the F91 Gundam, coincidentally designed in part by his estranged mother, Dr. Monica Arno. 
(Source: Wikipedia)

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