is it allowed to open two accounts with same ip, two account of different house members like two brothers with same phone.
As far as i know Binance prohibits multi account users on their exchange, but you should not be afraid to create your sibling account, even if it is the same IP, however you have to take the sub-account feature path.
The answers to your questions are below.
Binance Sub Account – Beginners Guide & How To Get StartedIs it allowed to have 2 Binance accounts?
No, Binance does not allow users to have more than one account. However, you can have more accounts using the sub-account feature.
For specific answers to your questions are here.
How do I open a second Binance account?
Unfortunately, one user can only have one verified Binance account. You can open a second account under your blood relative name, and the KYC needs to be done by them. Or, you can use the sub-account feature to have multiple Binance accounts under your name.
For more information, you can read on the link that I posted above, you are safe with sub-account feature and different KYC process, same IP, Binance doesn't mind about that, as long as you are comfortable trading on Binance Exchange.