Chapter One: Cyborg
If you ask Cyborg about Robin then he'll tell you that Robin is the Dad of the group. He's constantly trying to get the others to act older than they are, constantly trying to get them to 'grow up and act like they're super hero's, not kids' even though the are 'kids'. He's the Dad that everyone looks up to even if they aren't willing to tell him, or anyone else.
Cyborg's walked past Robin's room at 3 in the morning and found the Boy Wonder up working case files that the Police have given up on. He's also walked past the training room at 3 in the morning and found Robin working himself to exhaustion after they've lost a fight because he doesn't think he's good enough.
Cyborg knows that Robin is up at the crack of dawn every morning. Cyborg also knows that he's one of the first to go to his room at night, and one of the last to actually go to bed.
Yes, Cyborg thinks Robin's the Dad of the group. He also thinks that Robin's the type of Dad that needs to lighten up a little because one of these days he's going to go into a fight tired and not come out of it.
If you ask Cyborg about Starfire then he'll tell you that she's the younger sister. Starfire can't stand to see people upset, whether they're her friends, her enemies, or someone she's never met before.
Cyborg knows that Starfire is this way because she doesn't know how else to be. She's afraid that if she loses even one of her friends then she'll lose the planet she's made her home. Cyborg also knows that she doesn't realize this, just like she doesn't realize that she's in love with Robin or that no one likes her cooking.
He's found her walking around the tower unable to fly because one of the Titans have been injured. He's also been on the receiving end of her hugs. The hugs that could crush bones because she's just happy to be alive.
To Cyborg, Starfire is the younger sister that's trying to be friends with everyone because she doesn't know how cruel the people on this planet can be. He knows that the Titans shelter her from the cruelty of this world, he just doesn't know if they should.
If Cyborg's asked about Raven he'll tell you that she's the oldest sibling of the group. Raven's always locking herself in her room and distancing herself from the other Titans. She constantly tells them that she can't feel and that she doesn't need 'friends' but Cyborg knows other wise.
He's seen her get angry, angry over the Titans making a stupid decision, angry at the Titans for interrupting her reading, angry at them for trying to get her to go places with them, angry at pretty much everything.
Cyborg's also seen her get upset. He's only seen her break-down once and it terrified him but he knows that one of these days it will happen again. What he doesn't know is whether the Titans will be able to help her or whether she'll fall into the darkness for good.
In Cyborg's mind Raven is the oldest sibling of the group because she puts her happiness behind her friends, her 'families', safety. Cyborg also knows that Raven needs to lighten up a little or she will end up alone.
If you ask Cyborg about Beast Boy he'll tell you that he's the kid brother. Beast Boy's always goofing off, always smiling, and always looking for the good in people.
Cyborg knows that Beast Boy isn't always cheerful, he's seen the younger boy shout and rant until he can't rant anymore. He also knows that Beast Boy will lock his anger away and hide it from everyone until he can't hide it anymore. At the same time he's seen Beast Boy do things that Cyborg wishes he'd do.
He's seen him give the money he was saving for his moped to charity at Christmas and he's seen him take attacks for the other Titans even when he knows that he might not make it through them.
In Cyborg's eyes Beast Boy is the kid brother that everyone adores, the kid brother that just wants everyone to be happy because he himself is always happy. He also knows that one of these days something is going to happen and Beast Boy isn't going to be happy anymore, he doesn't know what he'll do if that happens.
If you ask Cyborg where he thinks he fits into this he'll give you a frown and tell you that he's the cousin that moved in years ago and never left.
He'll tell you that he's not as mentally strong as Robin. That he's not as friendly as Starfire. That he's not as brave as Raven or as giving as Beast Boy. He's just the geeky, overly strong, video game nut.
What Cyborg won't tell you is that he doesn't think he'll ever meet the standards that Robin expects from him. He doesn't think that he could ever hide his emotions like Raven does, he knows that he couldn't be as trusting as Starfire is and he doubts he'd be able to be as happy as Beast Boy.
Cyborg will tell you that Robin is the Dad, Starfire is the younger sister, Raven's the oldest sibling, Beast Boy's the kid brother, and he's the cousin. He just won't tell you why he thinks that.