Garet's family

Garet's family is a family of Adepts who hail from the town of Vale and is the largest family seen in the Golden Sun series. It consists of Garet, his father, mother, elder sister (Kay), younger brother (Aaron), grandmother and grandfather (the Mayor of Vale). None of these characters are named in-game, but in the Debug Rooms, the names "Kay" and "Aaron" can be found next to portraits of his sister and brother respectively. Furthermore, in these rooms, Garet's family is given the surname "Jerra", although this appears to simply be a variation of "Garet" that was never properly translated, presumably due to the fact that the player was never supposed to be able to enter the debug rooms (see here for full details). Thus, despite the large amounts of fan speculation that has lead to widespread use of these names, the unofficial and somewhat dubious nature of these sources means that for the purposes of this article, Garet's family will simply be referred to by their relation to Garet, rather than by name.

Garet's Brother
The youngest member of the family, Garet's younger brother, he is known to tease his brother about his appetite but also swears to protect his family in his brother's absence, something Garet will encourage if he returns to visit Vale after crossing the Lamakan Desert. At the outset of their quest, he is the one to give Isaac the Catch Beads in place of his mother, Dora, who was too grief stricken to say goodbye to her son in person.

Garet's Sister
The eldest of Garet's siblings, Garet's sister is somewhat bossy and overprotective of her flower garden (as seen in the beginning of Golden Sun, wherein Garet enrages her by crushing her garden while practising his Psynergy). Despite this, she shows obvious concern for her brother and wishes him (and Issac) well on the outset of their quest.

Garet's Mother
Despite being concerned for her son as he sets out on his quest to save Weyard, Garet's mother puts on a strong outward appearance to give encouragement to Dora and Garet's father, both of whom suffer greatly from anxiety when their respective children leave Vale.

Garet's Father
As with the rest of his family, Garet's father cares deeply for his son, and becomes very anxious after Garet leaves on his quest to save Weyard. He takes to looking after Dora when she falls ill after Isaac's departure

Garet's Grandmother
The elderly wife to the Mayor of Vale, Garet's grandmother lives with the rest of their family in Vale.

Garet's Grandfather
Garet's grandfather is also the Mayor of Vale, and plays an important role in the beginning of Golden Sun, namely, giving Garet (who passes the decision off to Isaac) the choice to follow the Wise One's instructions and pursue Saturos and Menardi or simply ignore their predestined fate (the latter option leads to a premature "game over").

In The Lost Age
In The Lost Age, Garet's family remain in Vale, and are hence are not visited throughout the game, as the Adepts in The Lost Age resolve to not return to Angara and instead focus on their quest. It is only in the epilogue, after the credits, that Garet's family is once again seen. After igniting all four Elemental Lighthouses, Felix and Isaac rescue their respective parents both from their captivity in Prox and the influence of the Wise One, who had turned them into a three-headed dragon. Therefore, Garet becomes the only person to have all of his family still in Vale. This is almost disastrous, as the four pillars of light emitted by the Elemental Lighthouses converge above, and descend onto, Mt. Aleph, triggering a cataclysmic collapse of the nearby landscape, which includes the town of Vale. Momentarily struck by grief, it is quickly revealed that all of Garet's family (and all of Vale's residents for that matter) had been warned by the Wise One of the impending danger, and they had all managed to escape harm.

Trivia

 * Although Garet's Grandmother and Grandfather both have portraits, they are not used in regular conversation if the player returns to Vale midway through their quest.
 * If fan speculation is to be believed, Garet's family is the only family in the series to have surnames, with the only other potential exception being Lord McCoy, though in actuality this is likely just a mistranslation. Either way, none of these characters are explicitly given surnames in-game.