Jack-O' getting double teamed by Sol *and* Frederick ("simultaneously existing/同時に存在" as mentioned on this page) is definitely well within the realm of possibility in the Guilty Gear Universe.

Base +22, MoonLightdimmed +4

Aren't SOL and Jack-O Father & Daughter?

Base +16

"Aren't SOL and Jack-O Father & Daughter?"
You're thinking of SOL/Dizzy.

Jack-O' is a sort-of-clone-reincarnation of his lover, Aria, aka Justice.
"That Man would later created Jack-O' as a "half-Aria", or rather, a synthesis of Aria's fragmented memory designed to overwrite Justice's individual information sectors, like a physical patch."

Base +22, Frank9969 +8

Sol Badguy's life in the nutshell: killing his wife's fragment multiple time til got his wife back, or something like that

Base +6