but dividing them and hiding the other part on another storage sounds risky because you can forgot them or other people will find it out and do unwanted things with it .
Yes and no. Splitting your seed phrase and hiding it in multiple places obviously increases the risk that someone discovers one of your back ups, but if they do discover one then they only have half (or less) of your seed phrase, which is significantly better than them having it all.
You should make sure to have at least two back ups of every piece though. Having a single back up, and then only discovering it has been stolen or damaged when you need to restore from it could result in the complete loss of your coins.
but if something happens to me then they will surely meet and will talk about it.
I would be careful about assuming this. If one of my friends left me a couple of words that I did not know the significance of, I'm not going to go around all their friends and family after they died and ask if anyone knows the significance of them. More likely I'll assume they were a password to something that is no longer needed now they are dead. Different if it's someone familiar with bitcoin, but with someone who has no idea what seed phrase are, your coins may end up irretrievable.