I'm glad for you Polarbear2 that there's movement and you may get some answers.
Like others, I found out 6 years ago (while going through a MacDonalds drive through answering a call from one of my sisters) that I have a brother .. half brother. Mum as a 17year old in rural Ireland in 1943, father unknown. The baby was "given over" to the Christian Brothers and farmed out to families as cheap labour, according to him.
Mum died 10 years previously so no answers from her. I do know she'd be horrified that her daughters knew - Aunts, Uncles, cousins all know, one cousin tracked him down without us knowing a thing, and met with him a few times. My elder sister couldn't wait to meet him, and has kept in touch but "the brother"'s wife is furious/jealous, and has soured things there. My younger sister and I have met him once, nice guy but very sorry for himself. His daughter though, my oldest niece now, is just lovely! Met her a few times and adore her.
My sisters don't know if our Dad knew (they met about 5-6 years after), but I'm sure he did, from things that were said at odd times.
"The brother" said if he'd know Mum was dying he'd have walked the ends of the earth to be with her. I didn't want to say that she'd have been truly, utterly mortified with shame.