I think, there’s a 90% chance Dani and Grace are related. The actress playing young Grace is a spanish actress and there’s pictures of her and Linda dressed in normal clothes, so she’s already like 11 to 13 in 2022. That means the post-apoc future is very close, but also that young Grace is someone Dani probably knows as a child. So even if there’s no blood relation, it would be super weird anyways and it would explain the affection Dani shows in the trailer as a non-gay thing. Unfortunately.

Oh, huh, that’s some good detective work, anon. Dammit. Except for the part where young Grace being played by a Spanish actress implies that Grace is at all supposed to be Latina or Hispanic, because Mackenzie…ain’t. I was going to question your jump from young Grace being present to her being someone Dani knows, but it’s a fair guess. It would explain some things. 

But anon, I hope you’re wrong. 😛