Antijen is run by Aunty - who hosts many lists relating to transitioning for both families and the person in transition. It's a great resource with very nice, understanding people behind it.
As well as transmale and transfemale lists, there is also a Significant Other and a Family list.
Plan to let Aunty know who you are, and a little of your background. If you are joining these lists, you probably have someone she knows on one of her other lists. This is information she needs in order to accept or reject your request.