Yes, that line Sansa said is what Ned told Arya back in S1 because she & Sansa are always fighting.
So it's great that it looks like Sansa has her head on straight and choosing to side with Jon as we all know people have been saying she might betray Jon and listen to LF.
I have a feeling another well-loved character will die. I wasn't prepared for Hodor last year and it's going to be sad again soon.
New pics of Kit and Rose at the Glastonbury Festival: