Gazelda - not sure if that is true, but most solicitors worth their salt will word a will such that if a DC predeceases a parent, then their share goes to any children they have. My parents wills were written like that and so are ours, even though our DC are still teenagers.
My parents will was 50:50, so DB and I got the same amount when mum died 2 years ago (despite him trying to persuade her that he deserved everything!).
However, a bachelor cousin of mine had died a year earlier, leaving his substantial estate to cousins' DC - but leaving out one for some inexplicable reason. The man involved wasn't bothered, he is a well paid professional, but his mum (my cousin) was - and still is - extremely upset as she was closer to the deceased than a lot of other cousins. She thinks she offended him in some way, but there is no way of knowing now.
Apart from that odd decision, most thought 'what a lovely gesture', esp as the cousins generation were aged 50 upwards. The money helped some get on housing ladder in 30s, whilst my teenagers will have a substantial house deposit when the time comes.
I say 'most' because my DB, with one child, thought it was awful that his 'family' only got one portion, whereas my family and another, got 2!
But there again, DB has never worked, thinks everyone owes him a living and was the only cousin who thought it should have come to our generation!!!! Even the cousin with no children was happy that his nieces got some money when needed.
Wills can definitely bring out the worst in people.