He says abuelo and abuela, which means grandfather and grandmother. The little girl calls them grandma and grandpa, and Telltale has already said that she's Javier's younger sister.
Timestamp?? I've dissected every frame of the video and watched it like 100 times, nowhere does it say abuelo/abuela
(oh the irony of you asking me this when I asked you to source something in a different argument and you just completely ignored me)
Anyway, it's what jayko was talking about. That person could have been wrong. The other thing is still correct though, and come on man, just use a bit of common sense. It makes way more sense for Hector to be Javier's father, and for Rafa and the grandma to be his grandparents. I know people who call their grandparents things like papa or ya-ya or stuff like that. So, considering that the little girl is Javier's younger sister, and she refers to them as her grandparents, it makes sense that "ma-ma" is just Javier's way of referring to his grandma, when he probably just called his mom... well, mom.
And regardless, we're finding out for sure in less than 20 days. No need to get so worked up about it.
So.... then I'd guess that Jayko's original family tree is probably closer to being right.
So he's both simultaneously the girl's brother, as was confirmed, and uncle, based on what he says in the trailer.
Some incest shit going on in the Garcia family already. His dad is also his brother or something?
They probably rewrote it between SDCC and the actual release. Maybe they didn't have Hector at the time and decided to say the mystery kids were Javi's siblings, but changed it so he's their uncle. I can that happening, that they added more people to Javi's family over time and it changed some of the relationships.