My DSC aged 10 and 11 are games mad which I know is perfectly reasonable for boys that age, but when they come round it's all they want to do and it dominates the flat. You can't get away from it because it's a fairly small place.
As soon as they arrive the PlayStation goes on the living room tv and the other one will be on their tablet playing games. Shouting at the tv/tablet. DH gives this the OK.
I have to keep their younger siblings away from the television because god forbid they touch the PlayStation / interfere with the game as then there will be a tantrum from the youngest of the two DSC.
They want me to watch everything they're doing on the games and as much as I think the world of the boys, I've grown tired of looking from screen to screen and feigning interest in the games. On days like today when the weather is miserable this goes on for 4-6 hours.
If i glance away, get up to do something or tend to one of my younger children all I get is "Look! Look!" even if I say sorry love I'm busy doing (whatever it is) right now. If I go to the bedroom to change the bedding or into the kitchen to make a drink one will follow me and demand I look at the game.
DH does nothing to discourage it or influence them to do something else because it doesn't bother him and he just let's them do as they please. They don't want to watch films or play board games. I bought ingredients to make our own pizzas on Friday and that went down like a lead balloon, they just wanted to stay on the games instead. I had hoped they'd discover they enjoy doing other things. Nope.
Whenever they're indoors they will do nothing else.
I will add that when we're outdoors with them they're a dream and there are no problems whatsoever. They're fantastic kids and I'm touched that they want to include me in their hobbies but it's driving me mad.
I've just gotten in from a walk to the corner shop to get them some drinks and the second I walked in I hear "ok so are you ready to come and watch again now"
I'm actually sat in the loo right now so I can get 10 minutes of peace from the bloody games. 
I understand that this is what they do at home, but I'm not thrilled about it happening here if it takes over the house like this. I don't feel able to address it with the kids as their DM would love a reason to moan about me, so it will need to be DH.
I also feel guilty for being annoyed because it's what makes them happy, but there needs to be boundaries I think?
AIBU to tell DH he has to address it and make changes for when they are round our place or do I keep quiet and just let them carry on..
Don't flame me, I'm not a wicked step mother and I think the world of those children - but I think anybody would be pulling their hair out with this right?
On a final note, I know it's a DH problem and I'll be addressing it. I just didn't want to be that type of step mum.