Relatives will be popping up left, right, and center on an upcoming episode of The Blacklist.

Liz Keen Turns To Tom's Brother For Answers On 'The Blacklist', True Identity Results In 'Spectacular' Fallout

Viewers previously met Liz's (Megan Boone) adoptive father, and soon the NBC series will introduce more members of the Keen and Reddington clans. As The Blacklist inches towards the end of it's inaugural season, a Craig Keen and a Walter Reddington will also make an appearance.

The two new characters will both make their debut in episode 18, "Milton Bobbit," according to Spoiler TV, and it looks like Craig will be Tom's brother.

Prepare To See Tom Keen 'Like You've Never Seen Before,' Who Is Ryan Eggold's Character Working For On 'The Blacklist'?

Although Tom has already spilled the beans to Jolene/Lucy Brooks (Rachel Brosnanhan) about his real job, Liz is not privy to that information and the profiler will continue probing into her husbands past in order to unearth his true identity. Her quest will lead him to Tom's alleged brother Craig, but (surprise, surprise) TV Guide claims that he may have his own secrets...and a possible tie to Lucy Brooks.

Stepping away from the Keen drama for a moment, it looks like Red will be getting a familial visit as well. Based on his surname, it is safe to assume that Walter is somehow connected to the FBI's master criminal, but exactly how they are related is currently unclear.

The Blacklist airs Mondays at 10 p.m. ET on NBC. Click the video below to see a preview of the series next episode, "Mako Tanida."