Found brother

[longlostbrother]

So never had anything to do with my dad but always knew who he was through family friends! Knew he had a son and they all moved over seas. None of his family knew about me not even my dads mum & dad! But I've found my brother and had a urge to message him and tell him! And know I fee totally unreasonable and sick! I shouldn't of done it but I seen a fb post from my dads new wife searching for some long lost relative (that wasn't me) and it really got my back up how they still to this day don't want anything to do with me! I need to calm down feel like I'm about to pass out!!

Why the fuck did I message my brother and tell him!!

This is sad and I feel for you, there's a similar story in my family.
As others have said you are within your rights to contact your brother but he is also within his not to want contact with you. It must have been such a shock.
I would not be doing anything to contact your gran that involves your workplace though, you could be risking your job.
A letter through her door would be better.

If you write the letter to your grandmother (and I personally think you should) make it really clear that you have not accessed any of her details through work. Name the family friend and explain how you know where she lives. Explain that seeing her every few weeks has made you realise she has a right to know about you.

Thinking of you x

Thinking of you. Hope it goes well. Please come back and let us know how it goes with your nan.

Just one thing struck me... it's not your responsibility to keep the secret. Your dad may have kept it as his dirty secret- but your heritage is not your dirty secret.
You are under no obligation to anyone to keep this a secret.

This is so true. My Dh outed himself to his father's family. While it hasn't gone perfectly it's just good not to be anyone's secret anymore. Knowing your medical history is hugely important for you and your kids. Dh is in contact with a couple of relatives now, not his father, but that may come in time. Dh did a DNA test so there was no hiding from that!