"If SHE isn't telling the parent there's a reason." S2 #933
And potentially a sensible practical reason.
Living under the same roof, sharing a meal daily with such persons tends to provide insight into their potential / likely reaction, on basis of their previous reactions to conceptually similar situations.
"And Emily's post points us in the right direction - she refers to her SON turning up at school as Samantha - If SHE is turning up as Samantha Emily is going to have to accept that she's got a daughter, not a son." S2 #933
That's one way of looking at it, a sensible way perhaps, for unconnected 3rd party observers.
But I'm not too quick to condemn a mother that endured the pain of childbirth, followed by a year or two of changing diapers, for basing her perception on the genitalia that have confronted her literally since day one.
My own mother was never quite able to fully abandon her perception of me as a young boy, even as I'd entered middle-age.
That's not an endorsement of gender dysphoria.
It's an acknowledgement that when humans must distinguish between a physical certitude such as unambiguous genital configuration, and a cognitive preference not their own, (how someone else feels)
we ought not be surprised that the physical, the visible has the advantage.
"On a related note, some 40% of homeless youths are members of the LGBTQ community. Some were thrown out and others left because the situation "at home" was intolerable." S2 #933
a) Tragic, but good to know.

b) Presuming this to be substantially true, rather than harshly criticizing the parentally inept,
is it not more constructive to suggest a better course?
Those on the sidelines can shriek their criticism: - Hey! You're doing it WRONG ! -
-
OR - Instead, how about:
"Have you considered trying this instead ...?"
note:
I, sear, a humble admin. with an abundance to be humble about, am woefully ill-equipped to provide lucid practical guidance here.
But due to the importance of what is at stake, perhaps this amateur example may be of some benefit:
To the inept parents mentioned in S2's related note in #933 can we offer this?
Inept parent:
You have no more chance of talking your child out of their own god-given gender identity than your child has of doing so to you.
In coarsest metaphor: "Don't try to teach pigs to sing. It wastes your time, and annoys the pigs."
Children can benefit from constructive parental understanding, not criticizing them for what they are not, but acknowledging what they are.
Seems vague?
Perhaps the serenity prayer may help simplify / clarify:
"God grant me the serenity to accept the things I cannot change,
the courage to change the things I can,
and the wisdom to know the difference."
If you love your children, they just might love you back.