It's in no ones interest to ban legit players who contribute to the business, but it also depends on what you guys are doing.
If you're just playing with your own routines, credit cards and games, everything will be done in the background regarding checks, the matrix will not flag you since it can see that you're from the same city/street/household, no one will get into trouble. Imagine people gaming from a hotel room or a resort, they are all on the same IP, but the matrix isn't triggered because it sees different account details, gameplay patterns and funding sources. I also used to play online poker with newly registered friends in the same room and operators wouldn't mind it since the reg data was legit.
So if you're not doing anything shady, don't worry about the same IP, friends connecting and playing on the same wi-fi and so on.
However, if you're both registering at the same time and trying to abuse the betting or bonus mechanic from the same IP, and additionally using store bought debit cards or random crypto wallets, then yes, you'll get banned.
Thank you very much again for your help. Now this clarify the confusion on this matter. The recent issue with same reason of problem makes me feel conscious about IP sharing. But I guess most of this user is indeed hiding something with their statement.
I will update the OP and include your answer to help other user cleard doubt about this sensitive topic that recently arise in the forum even though this already an old issue before.
I want to thanks everyone that share their insights. I hope everyone learn something here from @sirjonvonslotty(the real gem in gambling board secrion).