Yeah because siblings always get along.
*remembers brother I havent spoke with in 3 years*
Yep going through some sibling turmoil of my own.
true. she didn't get along with arya either and the only scenes with her and robb, bran, and rickon there's barely any interaction.
but i still think, based off of how robb was king in the north in season 2 & 3, that if he was in jon's place in season 7 he would've sided with sansa on this decision.
Roose was calling out Robb for having too much mercy when he was going to let go the Ironborn that took Winterfell (except Theon of course). It's possible Robb would have done the same.
Possible you're right though since Sansa was pointing out Jon needed to be smarter than Robb, and she didn't like that decision.