My DS is 6 and has behavioural issues. His psych recommends the use of the 1,2,3 magic, also giving DS a choice when it comes to behaviours to make it feel like he is in power. Like for example you could say to your boys "if you have your bath now, get dried and dressed then sit at the table, you can have dessert. Otherwise if you choose to muck around and make a mess in the bathroom, you can clean it up and go straight to bed". That's probably not a great example but you get the idea? I find it works on DS, like in the mornings when he is refusing to get dressed I will say "you can either get dressed or go to school in just your undies-it's your choice", works a treat every time.
I find DS2 doesn't care too much with the removal of ipad, DS, etc.. That method works well on my 9 year old though.
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