Your brothers 8 and 10yrs old? Shouldn't they already schooling? Guess they already have exposure to English eventhough are from Malay family, right?
Try to see what is your brothers' English level, if you found they need to start/re-start from very basic. There are plenty of English books meant for beginner.
Another easier teaching method is to encourage them to read out loud English newspaper. And to make learning fun.. teach them to listen to English songs.