On Saturday we leave for our big excursion to the Republic of South Sudan.  We take a team of 16 other Canadians with us and there will be lots of challenges.  My health will be an issue since it wasn’t too long ago that I came out of major surgery, but we trust it will hold up. But this year one special traveller will be journeying with us and for him the next few weeks promise to take him through an emotional roller coaster.  Our son, Ater, is 15, and this will be his first trip back to Sudan since he came to us six years ago.  Then he was just a small boy who, with his sister Achan, had suffered through the loss…