Thank you so much for all your responses!
I see that I lacked a lot more understanding of it than I thought and my view was fixated on the non-existent "3rd party preferred observer with an over-riding definition of what normal is for some preferred frame." as Grinkle mentioned.
I've...
I'm just trying to develop a general understanding of the 'twin paradox', so my description of this is will be a bit poor.
I feel like I have a sound understanding so far on the topic, but the only thing that I can't seem to find an answer for is this scenario;
Say you have the classic twin...