I guess I have the best chance for a solution in the official bethesda forum, so excuse me for my bad english, I'm from Germany...but my problems seems to be very rare and i didn't find the solution elsewhere.

The problem is simple. After obtaining Auriel's Bow, the next quest won't start. I sided with the Volkihar Vampires. Serana doesn't have new dialogue, except for creating bloodcursed arrows. I tried every dialogue option of Gelebor but this don't change anything. I found a discussion about this bug on uesp wiki. It seems I can't post links in this forum, so just search "skyrim talk kindred judgment" via Google, it is the first page.

I tried almost very idea mentioned there. I tried the following console commands:

setstage DLC1VQ08 10 or 20

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completequest DLC1VQ08

resetquest DLC1VQ08

setstage DLC1VQ08 10

There is no output and no quest update.

I tried this suggestion as well:

"After having this bug for weeks, I was able to fix it with a combination of the creation kit and setstage. Apparently its some dialogue condition for Serena that is preventing the quest from starting. So I enabled this quest in creation kit to 'Start Game Enabled'. This made it so after getting the bow, I would start Kindred Judgement. Serena still wouldn't have the dialogue option at this point. But I was able to setstage DLC1VQ08 20 to skip that part and move things ahead so I could showdown with Harkon. I have the .esp file if people want it."

I created a esp like that. I enabled "Start Game Enabled", but it doesn't help me either.

I'm not sure whether or not old savegames have the same problem. At first, I thought the setstage command would work with savegames before starting the dawnguard questline and sucessfully start the quest. But I retried it and now the console command won't start the quest even in completely new savegames. Maybe I used a wrong ID at first...

By using the command "setstage DLC1VQ08 20", I just get the output (with savegames before starting the dawnguard questline)

GetGlobalValue >> 0.0

GetGlobalValue >> 0.0

That is everything I tried so far. Of course I also deactivated every Plugin for all my test, but that doesn't help. Last idea would be complete reinstalltion, but I would like to avoid that, because I can't know if that will fix the problem and I have very slow internet (250 kb/s), so it would take quite a while.

But despite the deactivation of my plugins, I post here my compelte plugin list:

I tried the unofficial Dawnguard Patch, but that doesn't work.

And I have an even bigger problem now. I tried so solve problem with an esp file I created, but the esp file broke the quest "Touching the Sky", I can't obtain Auriel's Bow and the quest won't complete correctly. I deactivated the esp file and deleted it, but the quest is still broken. Why does a simple esp file break my game forever without saving the game? New games are broken, too. I can't start the quest "Touching the Sky" with the console. I consider to reinstall the whole game, because I have two broken quests now, but I thought give it a last try in this forum...

So what i would do: First of all install again all unofficial patches. (You don't have any of those)

Because you can't start the "Kindred Judgment" quest, that's not mean that you should uninstall all your patches. lol

I don't know if you messed something up with the console, but you should try this:

Go to a save prior "Touching the Sky". Do that quest again because it's a possibility that the game got glitched after obtaining Auriel's Bow.

That's from wiki:

The final objective to "Retrieve Auriel's Bow" may not properly register as completed as it should, even after picking it up.

A message signifying the quest's completion will still turn up, though the game ceases to progress after that.

Neither Serana nor Gelebor will have proper dialogue options, and the following quest "Kindred Judgment" does not begin.

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So after doing that quest if you have problem starting the next quest: Kindred Judgment (and only if....)

Solution: use the console command setstage DLC1VQ07 200.