Thank you for contacting Fusion Markets.
Since this is your personal trading account it is your discretion to give access to your brother for him to trade, but For your brother to have access to your account and trade can you please send us an authorization letter that he can have full access to your account, if in case he contact us and ask information about your account we can discuss the information to him.
I hope this answered your question. If you want to know more about Fusion Markets feel free to contact us.