What resurrection are they talking about? Matthew 22:28 I've developed the habit of not-just-reading the Bible, but dedicated my precious moment-just-after-waking-up time to give some effort to study the Bible every morning slowly. I read the Gospel chapters (Matthew, Mark, Luke and John) at least once in a lifetime, well I'm reading it yet again with a hope that I might find something new and astounding and now I'm hit with this particular verse

“Now then, at the resurrection, whose wife will she be of the seven, since all of them were married to her?”
(Matthew‬ ‭22:28‬ ‭NIV)‬‬

What resurrection are the Sadducees talking about? Because what I presume of the resurrection is that Jesus will come to earth, departing the heavens at the time no one knows, not even the angels (and we must be always prepared for him, living a blameless life, well, I repent all the time in Jesus's name, nevertheless, God loves me whatsoever). And while he comes again, the dead in Christ will rise first and are gathered together and ascend into heaven with Jesus. This what I imagine of the "resurrection" (of humankind) but when I read this particular verse, I am confused as to how they see "resurrection", from what I understand is that the Sadducees think "resurrection" is continuation of bloodline or something, when a husband dies, it is his male siblings' responsibility to continue his bloodline by making love with his wife or something like that or even if all his siblings die, the wife remains by herself as a childless widow, or someone "should" bear her children(I assume this is hard so that's the reason the Sadducees must have thought there is no "resurrection"). But my question here is, 
What resurrection are they talking about?
The Sadducees did not believe in the resurrection of the dead, the question was simply a set up.
Even though they did not believe in this, the resurrection they are referring to is the resurrection of dead the Pharisees believe in, which according to Act 23 is similar to what Paul (Christians) believes in.

6 But when Paul perceived that the one part were Sadducees, and the other Pharisees, he cried out in the council, Men and brethren, I am a Pharisee, the son of a Pharisee: of the hope and resurrection of the dead I am called in question.
7 And when he had so said, there arose a dissension between the Pharisees and the Sadducees: and the multitude was divided.
8 For the Sadducees say that there is no resurrection, neither angel, nor spirit: but the Pharisees confess both.