Like every other investment such as real estate, stocks and other forms of investment we know that you can invest in that kind of things and then you get something like say a Certificate or a Binding Document as a proof that you are part of that investment, now that of bitcoin all you have is just your address, your password, key and seeds as proof of the ownership of the wallet.
BTCSo now if one is considering buying bitcoins and saving for his/her children in the future is there any way to do that with bitcoins apart from having to write down your details somewhere. I'm asking because with that kind of stuff if no one knows your seeds or password no one can get the coins.

I think it would really be a nice thing if this matter would be handled by anyone with authority. We are all clueless on when are we gonna die and we don't want our money to go nonsense wherein nobody can use it even our relatives. If ever I would die, I want all my bitcoin to go to my family, I hope some few things would be made up for the convenience of the assurance so that it would go to them if ever.