Hypothetical, but it's made me wonder.
My 95 yo uncle died recently. He had 4 adult DC, numerous GC and approx a dozen GGC.
He has left 1/6 to each of the children, 1/6 to his church, the GC get nothing and the remaining 1/6 is split between the GGC
Now, he worked overseas for long periods in his 40s/50s and never went back to the family home when he came back to UK. I'd guess there's a reasonable chance there are children no one knows about.
Likewise with the GGC. Some of the GC have had colourful lives. One of the GC is currently pregnant.
The will just says children/ great grandchildren, they're not named.
What happens re the unborn child or if others exist? If they come forward now or are discovered in the future?
None of this affects me, I wouldn't recognise my cousins in the street,but it piqued my interest.