Their 4 year old boy coincidentally is also transgender.
No frigging wonder. He looks on, as a 4 year old, sees all of the attention being given to his older sister (soon to be brother), who he looks up to and wants to emulate, and the constant praise and affirmation of his mother, and decides he also happens to have been born in the wrong body. Thus he's set on the road of having his gender changed, via hormone therapy and surgery, from the age of 4.
Just bonkers. Those kids are going to be very messed up individuals when they grow up.