OK, I don't know where that is without checking the atlas.
But your poor girl. Such a lot of work for you
Of course, the trick of life is to be pursue happiness, however knackered .. especially when knackered. You must, obviously (if you haven't already), let things go a bit on the housework front. You simply can't do it all, so don't even try.
Modern life seems to produce so much expectation. Don't buy into it. Modern women are being asked to do so much more than their forebears. We have little/no parental support, we're scattered across the globe, we have little/no friendship networks.
Your eldest son is doing what all fine young men will do. He's helping his mum. Don't worry about the 'burden.' It isn't a burden for him. He wants to help, and it will stand him in good stead.
You don't need me to tell you that he needs his 'kid' 'time'. So, when he's helped you with chores (yes, I know ), and the other children are in bed, make some special time for him. Read a good story book together. Watch a cool DVD.
You're doing just fine. And if there's a perfect childhood ... well, I'd love to hear about that. I truly would. You do your best, and you kids will love you for evermore ... and they won't forget a single aspect of it. They will know that you raised them almost single handedly (because Dad was away doing immensely worthwhile work, btw), and they will always love you for it. And they'll love their Dad, and all.
So, missus, don't fall apart. xx