Both those brothers are careless with (their) money.
Every one of those brothers is bad with money.
None of those brothers are good at taking care of money.
＊もし兄弟が２人だけなら both those brothers を使って言います。
＊兄弟が3人以上なら every one of those brothers と言うか、none of those brothers を使って言えます。
「あの兄弟はそろってお金にルーズだ。」
1) Both those brothers are careless with (their) money.
2) Every one of those brothers is bad with money.
3) None of those brothers are good at taking care of money.
「お金にルーズだ」は
careless with money
bad with money
not good at taking care of money
などと言えます。
ご参考になれば幸いです！
日本 
