You have ID of all of your family?

That in itself makes you look suspicious. Normal people wouldn't have that.
If you playing on sector sportsbooks only while there has higher chance the account is getting requested by KYC. He really needed other document.
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I think, the reason why @OP upload 2 different document ID is due don't know the casino using Video Verification for the verify account. We all know, most of verified:
Level 1: Information Data
Level 2: Document ID/Driver license
Level 3: Proof of address
Level 4: Income stuff or other
All of these things, not required any video proof mostly just
document picture or PDF
. @OP knowing he will getting requested KYC in anytime cause these is not the first time he was playing (he moving around casino) due playing on sportsbook & we really know well sportsbook user is always getting limited bet size & KYC. He submitted his brother data stuff and don't want to use his data at the first palce, but the verification on FJ is different than other casino cause using video verification.
He can't passed those with his brother data, and submitted he own even he don't like it. No wonder the account getting flagged.... BTW for @OP failed verification is normal as long the new data you're input is always the same with the previous data you're inputed. If you inputed a different data, then is called "FRAUD" not just casino, even a bank can marked you as "FRAUD".
BTW, I pretty sure he having his brother PoA or other document not just ID maybe his other family too. Just can't passed the video verification ~XD