R.J. Grimes

Rick Grimes, Jr., nicknamed R.J., is a main character and a survivor of the outbreak in AMC's The Walking Dead. He is the son of Rick Grimes and Michonne, the half-brother of Carl Grimes and Andre Anthony, and the adoptive brother of Judith Grimes. He resides in Alexandria with his mother and sister.

Season 9
R.J. was conceived shortly before the disappearanceof his father and was born 9 months later

Michonne
Michonne and R.J. appear to have a loving mother and son relationship. He is first seen running up to her and she picks him up. Their interaction is very loving.

Carl Grimes
Carl and R.J. have a loving brother and brother relationship. He is shown to be missing Carl, when he decides to move to the Hilltop.

Judith Grimes
Judith and R.J. have a loving brother and sister relationship as they live together with Michonne. Judith is seen teaching R.J. how to ride a bike.

Rick Grimes
Rick is R.J.'s father. He doesn't know of his younger son's existence as he disappeared before he could find out that Michonne was pregnant. It is currently unknown how R.J. feels about his father or what he's been told about him. R.J. is named after Rick.

Gracie
Gracie and R.J. are friends. She can be seen teaching R.J. how to ride a bike with his sister, Judith.

Daryl Dixon
Daryl cares a lot about R.J., even before he was born, because of his relationship with R.J.'s father. Daryl mentioned to Judith that keeping her and R.J. safe is the most important thing for Michonne to do.

Season 9

 * "Who Are You Now?"
 * "Adaptation"
 * "Guardians" (No Lines)
 * "Scars"
 * "The Storm" (No Lines)

Season 10
TBA

Trivia

 * R.J. is the sixth known child in the TV Series to be born into the apocalypse, the first being his sister Judith Grimes, the second and third being two unnamed infants living at the Kingdom, the fourth being Gracie, and the fifth being Hershel Rhee, the seventh being Jerry and Nabila's son, the eighth being their daughter, and the ninth being their other daughter.
 * R.J. is the only member of the Grimes Family who did not have his own Comic Series counterpart.
 * R.J. and Judith are the only adoptive siblings to ever appear on the show.