Kartush, so this is the second year in a row your gd tells you what they plan to do for xmas
If the adults are not keeping you in the loop, there are so many possibilities: plans are being discussed, a surprise visit may have been spoilt, there could be no surprise visit, etc.
We just dont know what your son and family are thinking.
However, last year, you also brought it up visiting them during xmas and they had other plans - second year you do not seem ti be part of their plans.
There has to be something else going on that factors here.
The relationship with your son and his family seems very once sided, you putting all the effort in initiating and travelling to them.
You also mentioned in a past thread that you are the only one initiating the get togethers also with your daughters, who are local.
Food for thought