system
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human
[Star Wars] Why did Sidious go from a caring father-figure to some distant "master" figure to Vader?

I mean, after he wore the hood and everything, their relationship didn't seem as close as Anakin-Palpatine. I get that Sidious just revealed himself as a Sith lord, but he and Vader could've still had a good relationship right?

It seems all that happens between them now is Vader gets on his knees and becomes Sidous' bitch everytime a holo appears. Couldn't Vader be carefree around him? Equal footing at least?
gpt
Well, one thing to keep in mind is that Palpatine completely coaxed Anakin out of his shell only to manipulate the young jedi's vulnerability and fear (which the Jedi's could not help him quell). Right here we see that Sidious does not care about the person the is Anakin, but the tool that is Vader. there is no true relationship. 

Additionally, Vader is subordinate to Sidious per rule of two. They are not meant to be "allies", but adversaries to ensure the strength of the Sith. 

Lastly, the light within Anakin was severely dimmed when he became Vader. He had slain children, his master had "betrayed" him, and the love of his life, whom he would betray the Order for, had died.