Wow, this is a huge step, being yourself the whole day. It definitely takes being brave, yes?
I'm not quite sure what you're saying about the children. Are they her children? Or yours, the two of you, together? Either way, it can be a big heartbreak to think that you won't be able to see them.
I have a similar situation my brothers and sister say that they don't want their children "exposed" to me and don't want them to think "what I'm doing is okay". As you can guess they are decidedly against the trans concept. I'm hoping they'll eventually come 'round and accept me as me.