User blog comment:Scrawland Scribblescratch/Stuff I Wish to Speak About/@comment-32656-20120622182646

Until the birth if her children, the heir to the British throne under Victoria was her uncle, the King of Hanover. He'd have become king in the event you describe.

The government in Spain was the side opposed to the Nationalists.

As for the third, unlikely. No one else is likely to have been able to unite the communist factions, or to get the original uprisings started.