Writing down the words under same roof as my siblings

[Coyster]

Well it depends on the risk you feel you face having your seed phrase in the same house as your siblings (and you haven't really specified), if the risk is that of your siblings stealing your seed phrase and by extension, your funds, thus there is really nothing you can do than to move out of the house and leave alone before using Bitcoin and writing down your seed phrase, because if you are living with someone who you think can steal your seed phrase, then you are in danger of not only losing your Bitcoins, but quite a lot of valuable things you own.

Having said that, if the risk is of them accidentally damaging your seed phrase, then there are ways to avoid that, you can have it kept in places you keep private stuffs where only you can access, there are many other suggestions that have been provided above too, if this is the risk you face, i think it is easy to solve, but if it is the aforementioned one, then you need to find a way to stay alone or with persons you trust.

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[dzungmobile]

you can have it kept in places you keep private stuffs where only you can access

Just don't let others clean up your room, like this man.
How do you safely keep your recovery phrase written on paper?

Yesterday, my mom did a general cleaning on my room and when she's done, I saw the recovery phrase of my Trezor hardware wallet on the garbage

[Oceat]

If you have a wild imagination you can create an idea out of these replies and recommendations.

Some of the ideas I had read so far was:

• Making a treasure map on where they put their seed phrase combining with a puzzle on the safe box before they get to open.
  
• Put everything in a thumb drive that you always carry on with you whether disguised as a wrist watch or a bracelet or something.
  
• Create a custom designed necklace that has a secret locket where you can hide your seed phrase on a paper.
  

While some of them just don't want to put some effort to hide it they just rely on the internet to remember their keys as what the above have been suggested.

[Outhue]

Offline is the safest approach to keep your keys safe, I recommended carving all the phrases on a stainless steel that you can find, it doesn't have to be a round shape steel like a plate, it can be that of a box shape, carve the phrases on it and find a safe location to hide the stainless steel,  this is way safer than trying to cram some words off-head, what happens if you lose your memory or some kind of an accident happened.

[kamvreto]

Offline is the safest approach to keep your keys safe, I recommended carving all the phrases on a stainless steel that you can find, it doesn't have to be a round shape steel like a plate, it can be that of a box shape, carve the phrases on it and find a safe location to hide the stainless steel,  this is way safer than trying to cram some words off-head, what happens if you lose your memory or some kind of an accident happened.

That's also what I said before. Just cramming on memory skills would be very risky. Humans will have a period where they will forget something important, as OP did. If that happened without any backup then there would be nothing to do. Using a stainless steel plate is a good idea and will be safer for offline storage.
But while everyone was explaining various good methods and suggestions, the OP never appeared again. He just creates a thread and then it disappears.

[m2017]

my brothers and sisters are still younger than me but I don't know if they knew anything about crypto and wallet, but I have an idea, if it's stupid do tell me.  

Your siblings since they are younger than you will respect some boundaries if you set them, it will be a different scenario if you are the younger one, but not so in this situation. Also since they are younger, in most cases you can outsmart them. Even if you write down your seed phrase on a paper, do not be foolish to labeled it "seed phrase" or any name related to cryptocurrency or wallet. You can decide to extend the words by adding some dummy words too, or removing some words too.

That strategy of course is still not the safest because you cannot guarantee that other people will not get to it.

I would still not rely on the establishment of boundaries and it would be better to secure it in another way. The safest thing would be if the brothers and sisters never know or see your seed-phrase. Of course, until the moment when you are ready to share this information with them (if it happens) and when they are ready for it.

It is best to store in a place where they will not get (outsiders included). You will have to think a little about the choice of place and method of storage. Look around at home and try to come up with your own. It can be the use of the design features of your home, interior items and something else. And of course, you should not rely on easily destructible storage media like paper.

[Lida93]

Do your siblings have a habit of going through your stuff? If yes, then you could buy a  small safe as those things ain't too expensive ( you can find basic models for ~$50). If no, then there must be a place in your room where you can safely store it.

The thing is that everyone pocket is not the same while $50 might look not expensive, to another it could be an expensive sum. So in the case where the $50 for a  safe seems to be expensive then you can boldly write your seed phrase down in a plain sheet and have it placed  where you keep your important documents like your certificates and major project works, as your siblings won't wanna tamper with your certificates knowing the usefulness of them, this thereby also keeps your seed phrase safe from them too.
Mind you, my advise is only a cost effective one, in case you can't afford a safe.