I held a couple of similar secrets from a family member, she believed her father was born with my Swedish gt grandfather, she wasn't but I didn't tell her, she was elderly and I didn't feel I ought to upset her, he father was born with my gt grandmother but a completely different partner, it was well documented in the papers that my gt grandmother took a man to court for paternity, have never understood why, no DNA in those days but he paid up, he had a wife, I am the only one who found that out, so, I suppose you could weigh the situation up, do you want to upset your family and your beloved grandmother,?,, another thought is because she is against DNA does she already know?.
LM
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