Deimos has never once met Sanford's mother.
The circumstantial timing of their first meeting kind of disallowed for that, what with the world already having been plunged into seemingly permanent apocalypse by then. It hadn't come to mind for him, in all honesty, until Sanford had begun to trust him more and be willing to entertain questions about what life was like before the nightmare began.
A few times, Deimos did ask directly about what Sanford's family was like. Sanford had answered him directly in turn, and it left Deimos a strange mix of befuddled and disheartened, as if something was missing from his own life perhaps. He wasn't all too sure, emotional intelligence was never his strongest point, but even he could deduce that it wasn't the greatest feeling in the world.
Over months of constant companionship, idle conversations, and heart-to-hearts, Deimos learns more about Sanford's folks (and has begun calling them that, his folks, because that's what Sanford says).
The truck they ride around in all day belonged to his dad, Sanford learned how to fix it from him. He has some fabric scraps under the driver's seat from his mother's clothes, they don't smell like her anymore but sometimes Sanford pretends they do. He describes what that scent used to be so vividly as if he last experienced it yesterday. She taught him to cook and he still knows some of her recipes by heart. When he passes that knowledge on to Deimos he says it feels like he's preserving the memory of them. Deimos has never questioned if Sanford knows with certainty if they are alive or not; he judges by how sometimes Sanford's voice wavers a little during the topic that he's better off not doing that.
"Ya think your ma would'a liked me?"
Sanford raises an eyebrow, "N' where's this comin' from, bud?"
Deimos shrugs a shoulder, "I dunno. Ya just talk 'bout her like she was so smart n' sweet, real well-mannered lady, n'.. I dunno. If we met 'fore, somehow.."
Sanford grunts at him in acknowledgement. A silence settles somewhere between comfortable and not. After what feels like a good few minutes, he exhales, only a little shaky. "Yeah.. yeah, y'know what, I think so. She'd definitely want ya outta them raggedy ass clothes, but.."
"N' no cursin' round ma, no cigs neither."
"Nope.." a beat of silence, "Ya remember allat? 'Bout my ma."
"Well yeah I do, ya told me it, didn't ya? She's a special gal.."
Sanford coughs, an attempt to cover up some other less casual noise. "Yeah.. course she is. Ya would do fine by her."
Deimos will never meet Sanford's mother. However, he will try his best to do right by her, offer respect and care to her as an extension of Sanford. Even if Sanford has dreams and desires for more than trading memories, the impossible reality of Deimos sharing space with his parents, he thinks the effort to come as close as he possibly can is plenty for what their lives are.
"I get it from ya, Ford."