Mh. I don't know about you guys, but this is kind of a sad situation, because it is true that he could be lying and this is indeed a case of a purchased account. On the other hand, I can easily see a sibling gifting an account to someone within the family, specially if that person needs a lil source of income.

Unfortunately for you, Martyns. Even if your story is true many people around here believe that accounts being gifted is a bad thing because there can be an abuse of the previous onwer's reputation, to do many bad things. There are others who do not mind much. I personally, cannot argue about it. Because in the same family there can be an honest sibling who is honest, cares about reputation while the others do not mind burning an internet account they did not leveled up, so they can make a but of money in an illegitimate way. Not your case, but it can happen.

Perhaps, this would have been a different situation I'd your brother opened a reputation thread asking for people's opinion and letting them now about his consideration on gifting the account (together with a signed message).

Anyways, Take care.