Steam is not a move cash around company, that can only be miss used, hijacked a account and wola you have a way to transfer money if this was allowed.

What you do though own banks or credit card company is not a steam issue.

i bet you could even use own credit card at brother account, and set in money, dont think this is a problem also why steam in so many case do not use credit card as only proof.

just pay attention on credit card use at other brothers aacount, this is why i said what you do in own transfer to brother sccount is not a steam issue, or do a add funds at hes account, then you avoid credit card compnay if this is a issue.

I doubt a Compnay like steam have to deal with where the money come from then its a own family that paid for it.

You paid your taxes, rest is not any Comapanys problem as fare as i know.
require some serious law cahnge in alot of country to controll that part.
So a goverment can what come and beat us for what a game cost at such small amount, never going to happend fo some few games.

ps.

Do not store your credit card at brother account ( save the credit card information )
might be the most importen advice. any here can give you.

Originally posted by Quietus:

I need to buy in game items and it need game currency i need to get money from my brother's steam wallet currency so i can buy in game item with that money. What is the fastest way to do it?

Do not attempt to move money between accounts because things like this can get flagged especially if you have to manipulate market pricing to facilitate it. Both accounts will end up getting locked otherwise. The only way your account can buy items is directly with its own wallet currency.

Have your brother buy the item and trade it to you.