Laurie Leigh wrote a genius blog article on the Hazards of Working at Home which I recommend any stay at home artist to read up on.
I'd also like to add a couple of my own:
1. Talk to family members and gently make them understand that just because it looks like fun, doesn't mean it doesn't need to get done. Painting is still work and as much as you want to chat about their day/make them food because their own hands were clearly not working/come watch this thing on tv, it can wait until you're done or at a stopping point.
2. Routinely treat yourself to galleries, museums, botanical gardens, beach and even the mall outside of your local one for inspiration. You'll feel better for the new air and the beautiful surroundings.
Now, back to work!