Quote Originally Posted by Suzzy View Post
In my family there are 2 sets of identical siblings.

The first set are females aged 31.They have tested as Myers Briggs ENFP & ISFJ. They live in different towns and whenever they have sat an online personality test they ring each other up to find out the results. If their results differ for that test, then one will always go back and resit the test and it will then come out the same as the other, so testing them is very unreliable.
One twin (and this twin changes) is always quieter than the other. As young girls and even now they would occasionally alternate between acting introverted and extroverted. One would take on the role of being soft spoken, a bit shy and the other would be slightly louder and socially more comfortable. Despite these two acting different at different points in time I do think that they are probably the same personality type.

My youngest sisters are 17 and are in fact quadruplets. One who is not identical had a twin who the doctors think was identical but who died in the womb, so the remaining quads who we now call triplets contain 2 identicals and 1 fraternal (non identical). One of the identicals was far quieter than her identical when they were younger but now she is the louder more confident outgoing one of the two. One is more emotionally up and down the the other but the other does have her moments. They have the same best friends, same interests and hobbies.I would say that overall they are probably the same type. The fraternal triplet is clearly using a different type to the other two.

I think that you need to watch identical twins long term to get a true idea of the personality type that they are using, for every so often they can switch easily between being quieter or louder depending on what the other twin needs from them etc at points in time. This happens naturally without any words being spoken between them and can last for just a moment or for a much longer period.. And because of this swap it will appear to others that one identical is louder, more outgoing than the other.

Identical twins in my family are most likely using the same personality system but probably have different enneagrams which I think allows them their own uniqueness - roles in society etc.

I'm not sure that it is worth mentioning but both sets of identicals were born with one twin somewhat heavier than the other and it is that twin in both cases who overall is the twin more in charge (though not always!).
That's interesting observation.