Can you say with 100% certainty that they haven't been swapped at some point?
I don't mean as they've got older I mean that at some time when they were babies could you of thought A was B and then continued to think so until now?
This has really got me thinking as DD has identical twin boys in her class & I mean identical, there's no visible differences at all, no birthmarks etc.
Their dad was chatting with a group of us at school pick up time & someone asked what was the best way to tell them apart & he said one A has a deeper voice. For school they have their names embroidered on shirts, jumpers etc & different coloured jackets to aid the teachers.
Then someone said if their voices didn't become apparent until they were talking did he think they'd ever been mixed up at some point when they were babies or did they dress them in different colours etc & he said 'no it's entirely possible'
Obviously it was said in a joking way etc but really got me thinking if that could actually of happened in cases of extreme identicalness (not sure that's actually a word)