Do you mean company's private key? It's impossible, if he's hiding some, I bet there have been news (incidents) that continued as soon as his death was spreading.

I wouldn't say Google Drive is weak for security.  Because it will completely depend on you. Google Drive service is provided through an email.  When you save something to Google Drive you must have that email and whoever has that email will have access to your driver.  So unfortunately if your email gets hacked everything will be stolen from your drive.  And email hacking is a very common thing that happens many times, so I think it is better not to keep important documents, especially the backup or private keys of any wallet in Google Drive.  You can keep it offline on a paper note or pen drive, it will give you better security.

It seems like a bad joke that you have chosen for your nickname: "Not your key not your BTC"

No, it has already been explained to you. Move those funds from the cloud to cold storage ASAP if you don't want to lose them. I hope we are talking about low amounts, I can't imagine you have millions and are asking that question.

I'm doing this too but I input 3 words wrong in my recovery seed phrase so that only 3 words will I need instead of 12 and also as safety precaution in case my google drive is hacked. It will be difficult for a hacker to spot what's wrong in case he will try to use software to crack it. I really don't like the idea of writing it physically because I will not be comfortable when I'm away or there's a natural disaster hitting my country. I believe storing the part of it on our brain will make it safe to anything unless you die which is almost same if you written it on paper or online since your relative will never about it.