Dad is the son of Nanna and some Mystery Suitor.  John is the biological son of Nanna and Grandpa.  They share one parent, therefore they are half-brothers.

No, Kanaya was Vriska’s server player and cleaned up Vriska’s hive.

Retconning is changing what happened in canon after the fact.  John is going back and changing parts of the story. And unlike time travel he doesn’t have to worry about creating doomed timelines.

Both.  If the death is neither heroic or just then they return to life.

The remains of his house.

You have to find a key in order to unlock a captalogued item.

wait can i get a source for that

Here you go

His Dreamself got knocked out and he needed it to wake up again immediately 

In the Alpha timeline that would be:

Tavros, Karkat, Sollux, Nepeta, Equius, Kanaya, Gamzee, Terezi, Feferi, and Eridan

But we have seen doomed Karkat, Eridan, Tavros, and Feferi be god tier.

Not all the questcocoons where shown, but all the ones that were seen were round.