Hash to verify
https://s3.amazonaws.com/roll-verifier/verify.html?server_seed=6b7a6aa7f197ff9ab0ea62d81d4407e73a46d83c0997f845789ad9ce0a0e0e8b&client_seed=Cvw6IpNt7WcvcGrm&server_seed_hash=0980616556f786f0ec40e1363b57d8f37e7890437ffad4a75b7bce5475902971&nonce=94
Probably the system has detected you guys as fraudulent accounts as cheating the referral system due to the fact that both of you share the same IP. If you guys do then that is indeed the problem. Or maybe you just made up the brother and me story so you can withdraw your winnings and referral commission, if so you should probably stop as it's illegal.
what's next? calling the F.B.I.for sharing a router? you can't expect to not have those kind of situations, I'd say they are the most common than ever. the site too promotes referral as sharing with family and friends, so he's doing anything illegal. Furthermore, the website doesn't allow more than 1 free roll claim per IP per hour, so it would be useless to "cheat" in that way.