Just to add - You asked about visiting your sister for Christmas and if you should change your plans because he changed his? I think not. I think you made the plans and should go see your sister.
If it helps what I think
AJ
"Our lives begin to end the day we become silent about things that matter" MLK Put the glass down... "Yesterday I was clever so I wanted to change the world Today I am wise, so I am changing myself."
