It sounds like you were fortunate for the donor to be discreet and respectful.
There is another side to this all. Mom passed almost 2 years ago, and donor passed 3 months later. Mom had a bit of dementia, and donor quite a bit. Mom 81, “dad” 83ish. That doesn’t bode well for me, but at least I’m aware of it. Genetics is important for health reasons, especially for knowing about potential family traits. I hope in *less* than 20 years we’ll have figgered out this dementia stuff. I’d rather not subject my kid to this crap.
On a side note, I am being especially nice to him lately...he’s gonna choose my nursing home!