I'm just really struggling. Fortunately i have the Brittrex secret log in key and i think i also have the 2FA codes too. I searched paperwork and thankfully found them. Can i still access the account?
You will need at least three things to access the Bittrex account - the email address associated with the account, the account password, and the 2FA code. You may also need access to the email account.
The first thing to do is to restore the 2FA secret code in to a 2FA app. I would recommend an open source app such as Aegis. Download it, hit add account, select "Enter manually", and type your 16 character secret code in to the "Secret" field.
Then go to Bittrex and try to log in with your uncle's email address and password. Supply the 2FA code when asked. Since you will be logging in from a new IP, they may also send an email to the associated email address for confirmation, which you will need to be able to access.