All Our Questions After Episode 1 of Disney+'s "Moon Knight"

At the beginning of the first episode, Steven calls his mom as he feeds his fish and heads out to work, but she doesn't answer. He also calls her mid-episode, and they seem to have a conversation, though viewers only hear Steven's side. Because Steven seems to not be a real person, who does Steven think is his mom? Is he actually in contact with this person? And will they show up before the end of the show?