Hi Irish,
I, like you, waited a year after my reunion with my birthmother and 3 half brothers to attempt a reunion with my birthfather's side. Unfortunately, he is deceased as of 1991 so I will never meet him.
I found out through his obituary that I have 2 half brothers and 1 half sister on his side. I asked my birthmother if it would upset her if I tried to find and make contact with my birthsiblings on bdad's side. I said to her, after all, they have nothing to do with her relationship (or lack thereof) with my birthfather and they may want to know me. I also expressed to her my desire to know whatever medical history they might be able to provide. She told me she completely agreed and understood and would even help me find them if I wanted her to since she knew people that would definitely know their whereabouts. I thought that was very gacious of her. However, that may have just been rhetoric since she never did follow through.
I went ahead on my own...and with the help of a Search Angel
I found my sister! 
We've been in contact (by phone and text msg.) since Jan 29th and I'm just exstatic and apparently she is too
I've never had a sister...I was raised with a brother and I just can't express how unbelievably happy I am about this relationship so far. She had no clue I existed and she told me she cried when she received my letter. We both feel like we've known each other all of our lives. She's my only sister and I'm her only sister. We're only 2 years apart and I feel like this is going to be a special relationship for both of us for the rest of our lives. I've found out that my features and body type favor bfather's side of the family and that was important to me also since when I met my birthmother, I didn't really resemble her at all. Now that I've seen pics of my bfather I can more easily see what physical characteristics resemble him and what ones resemble her.
I hope you make the connection with your birthfather's side...If only for the possiblity of having a special relationship with your sister. Best of luck to you!!!!
