intersex people are exactly that - somewhere outside of the binary of the two sexes. Thanks to them we see the clearest example of how gender is simply assigned to a child at birth. Majority of intersex children are forced into one of the binary sexes and then forcefully assigned a gender to match so they can be "normal".

and it honestly comes down to the individual if they see themselves as trans or not, some might see what their parents did to be a forced transition, some might want to detransition from that, some might not