Hi, I suffer from SAD too, used to get me really badly. Here's what I do now.
Around October, start taking St John's Wort, 900mcg a day, through til about the start of May.
Use my light box for 2 hours every morning over the same time(make sure yours gives out at least 10000lux at 50cm away, lots don't do enough)
Get enough cardio exercise - for me, to keep off the depression, I need about 30 mins, 3-4 times a week.
Anytime the sky is clear, wrap up and get outside at lunchtime.

I'm not as good during the winter as I am in the summer, but this lot together keeps me from gaining weight badly and more importantly, slipping into major depression.

Oddly, the exercise seems quite vital. I don't go mad, just 30 mins walking, working up to jogging bits at a time. It seems to be enough, but if I don't do it, I notice the difference in my moods.

Good luck with it, hard when your family suffer too and you're trying to keep them up as well.
Take care, Jay