Mothering.com Community Forums
A forum for those of “the natural family living community.” It is not exclusive to mothers, despite its name.
There is a specific section for queer parenting, which also includes references for parents of trans and queer children:
Parenting of Trans and Queer Children
There is also a specific section for Canadian parents:
Parenting for Canadian Parents
Tags: children, mothering, parenting, queer, queer parenting, trans