Yes, it is very possiable Tig Tig is not far from his home. Have your sister put oput food and water for him and his favorite blankie close by.. Who was it that lost one of their babies when it got out and went out in the yard, sat down and read out loud and the kitty came out of the bushes. Maybe she could try that too.

One thing I have learned from PT and my own experience is they are never far from home but calling will do no good.... it is like during the day when they are sleeping and you call and call and they just will not budge. If that fails during the day, have her do it evening and or night when they are awake and roaming.