Uhmm possible but VERY difficult. you would need to inform the program if it has OUTPUT SELECTION settings for one screen to play it's sound to the HDMI while the other plays it to the laptop, but if your talking you watch netflix while they watch netflix just two different screens, NO.
Depending what the 'source' is your little brothers are watching as compared to you , might be best to look at your Blu Ray player, thier PS3 etc. as these include many 'websites' that can stream stuff (like netflix) on the TV while your on the laptop (single screen again).