@Rollbitscammedme Hi there and welcome to the forum.
Similar cases to yours have been discussed many times before in this forum - some were resolved, some were not.
The thing is, when your brother has an account at the same casino, the casino would usually regard it as a duplicate account issue (same IP address), or may consider both accounts as having falsified info.
The first thing you should do is to write in to the casino manager, explaining in good detail that both you and your brother have an account at the casino but under different names. You need to show proof that there are two of you involved and is not a matter of a duplicated account.
Some casinos may eventually accept this, some may not, so good luck to you in any case.