Despite the fact that she wasn't even born by the time Mikhail was a full fledged cosmonaut, He still did all she could to liberate her from Limbo. Then he got lazy and cooked up a plan to reanimate her corpse. Then he got bored with that and tried to rope his brother into making a brand new Snowflake out of their shared memories.
Then. sometime later, he sacrificed himself so that if she did happen to be alive, her soul wouldn't be corriupted by pure Rasputin evil.
But not before setting up his own nightmarish other dimensional kingdom where he ruled as despot. Oh and of course, he tried to rape the hell out of Storm a couple of times. One time, she consented.
But now that Yana has the ability to basically do as she damn well pleases- do you think she should make an attempt to save her estranged brother since her relationship with Piotr is basically null? Does his sacrifice even matter since she has no soul to corrupt? Would she be able to manipulate him as easily as Colossus, or at all?