I'm pg and thinking through the whole TV rationing thing so this thread is really interesting. DH and I have a TV but the only thing we use it for is to watch DVDs. We are too busy to bother with soap operas etc and as we never watch TV we never find out about upcoming TV shows or series so we never watch them either.
I do not feel particularly disadvantages when people at work talk about current TV shows that I have no knowledge of. When I was younger I watched a lot of TV (not allowed one in my bedroom though until I was 15 ish I think), but as I grew up I did much more physical stuff instead and much preferred it - it made me cooler too
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My big hate is advertising, I feel that it sets up expectations for children of what they "should" be allowed to have, I have read about the psychology involved and it's eye-opening. I hope to explain to my DCs, when they are old enough, how advertising works so that they know when they are being manipulated, as there is SO much advertising on TV it's unavoidable.
I think if you remove TV altogether (however tempting that sounds), it will become a guilty pleasure when they visit other friends. I was a chubby baby and my mum banned sweets, chocolate and sugarfor a few years - consequently I would gorge on them at friends houses and to this day, sugary stuff has a "naughty" appeal to me that means I have no self control at all around chocolate, cakes, biscuits etc and I wonder whether, if I had been allowed them in moderation, this would not be the case.
I digress, sorry, but it is all kind of linked, in a roundabout way. So I understand your motivation to spend more time with your CDs (and it's a noble one), and think that YANBU in that respect, however I think that YAB a bit extreme maybe, and perhaps rationing TV as others have suggested, and explaining why in as much depth as you can given the ages of your DCs, might be more productive. Could you make some sort of "activities in a hat" thing where the three of you write down lots of joint activities (eg baking, craft etc) and fold them up and stick them in a hat (or box, or bag) and you take turns to pick one to do instead of watching TV, so that they feel more involved in the decision? I think your mother is BU by the way and should butt out, but mothers and their opinions is a whole other thread!