They may even have been directly related to Ifalna. 'Perhaps Dyne's just crazy, but what if he does actually hear Eleanor calling out to him? This ability to communicate with those in the Lifestream could imply that Eleanor is a Cetra (or perhaps even Dyne.)' Aerith's mother Ifalna is widely regarded as the last living pureblood Cetra, but either Dyne or Eleanor could have also been Ancients.
'What's interesting is that in the Corel Town sequence, Dyne actually claims he hears Eleanor speaking with him,' Aliasis writes. (In theory, these events should play out in FF7 Remake Part 2.) 'Eleanor died during Shinra attacks, which caused Dyne to go crazy.' Barret adopted Marlene to honor his friend, whom he thought died years prior, but in the original game, you find out that Dyne survived to become the leader of Corel Town prison with his own gun arm. Who is Marlene? 'Marlene is Barret's adoptive daughter, but biologically the child of his friends Dyne and Eleanor,' the redditor explains.
Marlene is a 4-year-old-girl in 'FF7 Remake' who's the adopted daughter of Barret.