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*** Caution: Speculation Area - Tin Foil Hats Must Be Worn By All Personel In The Area ***
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Mama Katherine is centered (hearts and all) and may well be the center of Castela's universe.
Grandma Lily (tears and all) is on the same level and next to Mama.
Aunt Monica (Mama's friend, astral fire) is also on the same level and next to Mama.
Susie (Lily's partner in the FBI) is next to Grandma Lily and Aunt Bud.
Aunt Bud (haystack hair) is next to Mama and Suzie - both helped Mama on her grand adventure. Aunt Bud also touches Atsali and Aunt Shelly who is Aunt Bud's friend.
Aunt Jin (the Timekeeper's daughter) touches Aunt Monica - the two have become fast friends.
Aunt* Brandi (the former Chessmaster) touches Aunt Jin and Atsali. Both Brandi and Bud were involved with Atsali during Mama's grand adventure.
Suzie overlaps Aunt Shelly a bit. I don't recall Paul showing or telling us anything about a relationship between Suzie and Shelly. As far as I know, they first met at U296 during "Ladies Night". They are both guardians of sorts and have both protected Monica at one time or the other.
Atsali is also centered but at a distance. Not surprising considering the friction between the two sisters, but they are still there for one another.
* While Castela refers to Bud and Jin as Aunt, I don't recall her using that term for Brandi.
** Edited to add Tin Foil Hat warning.