I think you will need a cautious plan to be able to sell your BTC without affecting the BTC Price and the entire Crypto market, while maintaining the very good anonymous that Satoshi has tried to preserve for many years.
In addition, you also need to educate your children to understand your vision, and the value that anonymous can bring to them and the crypto market. If you want to be anonymous for safety, you definitely want your children to do the same.
Just by moving any of the bitcoin that's flagged as satoshi's would break down the whole market because of fear of dump. Not to mention selling them, even a fraction of it would give a clear signal what could happen next.
And there's no anonymity with bitcoin. You are confusing it with pseudonymity. But yeah, if i had a satoshi and i had kids, i wouldn't tell them until they were adults and mature enough that they could keep it as a secret. But i doubt that Satoshi had kids, because those change your perspective to things, and he/she definitely would have left his coins to his/her children, and when you have kids, well being of those is going to be a top priority and ideology of decentralized money will come second.