I mean they both have that huge mouth. Rex eating that roasted Crustip claw says alot...

they both share that "want to protect smile"

After Torna the Golden Country, I've always thought that Zeke redeemed what his far distant ancestor couldn't. He mended family ties whether he knew it or not. Addam tried, but obviously Zettar was too envious, so it was out of his control. They would never got along. Fast forward to the future and we see the descendants of two estranged Tornan Royalty working together on the battlefield, both working for self improvement and the bigger picture for Alrest, and having mutual admiration for each other.

The fact that Addam and Rex address Azurda as 'Nuncle' and 'Gramps' while it's not a direct evidence is in my opinion a little hint Takahashi included to avoid giving a direct answer. Also Rex meaning 'King' in Latin could enforce his royal lineage. Regardless of Addam being half blood, the king of Torna designated him as his successor.

If you talk to one of the NPCs at the villa they talk about how there are planning to escape to Leftherian if things goes south.
Also with the sidequest dealing with monsters from Leftherian are invading Torna this implies that the titans are close to each other.

Zeke is actually a descendant from the king of torna’s brother

Also, nice touch with Fonsett. The kids all have blue eyes, Tornan trait. The only kid/teen with golden eyes, a Leftherian feature, is Rex.

I like to headcanon Addam's wife, and possibly himself, settled down in Leftheria after the Aegis war.
This would mean that another reason Azurda stuck around there for as long as he did was not only to protect Spirit Crucible Elpys, but also to keep track of Addam's bloodline, whether in hope of another of Addam's blood rising to bond with the Aegis, or in a posthumous favour to his friend, making sure his descendants are relatively safe and happy.

Another reason Zeke is close personality-wise to Adam is there arts have the same effects. They both have Lanuch, blowdown and front atk up arts

Jin made the order to hire Rex not Malos because Jin was with Addam 500 years ago so basically Jin knew the direct decendant of Addam

Unless they come out and say "no", it's a yes for me since it's heavily implied

obviously their eyes duhhhhhh cause that plot point comes up once...

one more point that make Rex's addams descended is Azurda (gramps). why Azurda stop protecting Spirit Crucible Elpys to be Rex's titan ship for Salvaging?
He need to protect Rex and only Rex at all costed.  Azurda had to have know somehow that Rex is addams descended. why did he train Rex and only Rex in blade arts skills in Fonsett Village (play time!). Azurda had a core crystal ready to give Rex when the time was right.  Azurda Know Rex could open Spirit Crucible Elpys even when he was not born in  Fonsett Village.  what Azurda does in the game are huge clues to Rex's blood line.

Crests, wait this isn't Xenoblade Chronicles 2, it's Three Houses!

Xenoblade 3 confirmed Rex is the CEO of sex, so yes, they are related.

Xenoblade 3 spoilers! You've been warned!





Considering the now older Rex is the spitting image of Addam in that photo, it's practically confirmed

Excuse me? ZEKE? Do you not mean, The Zekenator!?

They are both related. Its first alluded to by Malos commenting on Rex's eyes, then the multiple times Pyra and Mythra compare their likeness, and what sealed the deal was what Rex told Jin during their last fight in Chapter 9. MAJOR SPOILERS: https://youtu.be/60WhCcfcSBE?t=43322 Jin knew Mythra's true driver was not Addam, and her true driver was someone in the distant future. When Rex made those comments in the link i just mentioned about descendants essentially passing the torch of knowledge to the next generation in order to continue ones legacy beyond death, it stopped jin in his tracks. .I think that was the point where he realized Rex embodied everything that Addam was unable to achieve and that the blades true purpose was staring him right in the face the entire time.

Another thing I would like to point out is that in the Xenoblade Chronicles 2 complete works book that came with the special edition of the game there are like 3 artworks (one of them from the Spirit Crucible Elphys entrance) which features a characther that most likely is Rex (because of the salvager suit and Pyra’s Blade) but with grey hair (or whatever Addam’s hair color is, I’m not an expert at colors) which because of the time of its release implies that at some point of the development Rex’s art design was similar to Addam’s art design later in Torna

Luxin, remember, the crew Malos and Jin assembled were ALL only from Leftheria. It was stated by Bana that they specified the whole elite team needed to be Leftherian. They were obviously banking on at least one of the crew having the right DNA.