Going along this path doesn't necessarily lead to transition - it leads to knowledge of self though. Perhaps you will be happy expressing your feminimity as a crossdresser, perhaps you will end up needing to go all the way and transition. You don't really know that until you explore your feelings and memories.
The fear of telling your family is understandable, and not unjustified. Sadly, many people simply cannot accept such a shift of paradigm, and reject you. Others accept but drift away, yet others just need some time, but come back in the end.
Ultimately though, you have to make one simple decision - live for yourself, or make others happy. And that's a loaded trick question. I lived to please others for 20 years, but what I realised eventually is that, unless I am true to myself first, I will never make others happy, because I will always be miserable, and I will project the sadness, or I will blame them, or I will this, or that. Only when you love yourself can you really love somebody else. What I found with my own situation was that the love I felt for others before I accepted myself was a neediness, a need to validate myself through others.
Granted though, my situation was simpler. I am only 29 today, and have fewer commitments. But ask yourself this: Do you wish to keep this from the ones you love because you want to protect them, or because you are simply scared of losing them? The younger children are, the easier it is for them to accept these changes. As to your wife, it will be difficult for her, perhaps moreso than she can bear, but somewhere you have to choose the lesser of evils, whichever they may be. You have some degree of GID, and that will colour your relationship - do you hurt her now, a clean wound she can move past easily, or do you keep living the lie, and make the hurt later that much worse.
That was the question I asked when I made the decision to divorce my wife. I knew I was being a coward and hurting her terribly, but I knew it would be worse if I stayed.
For now though, explore yourself. Keep a journal, diary your dreams and your memories, see a therapist, read some philosophy and psychology and stuff. Your path will become clear to you eventually, but you don't need to jump the gun just yet.
And finally, good luck hon.