Congradulations! They have what is important. You are doing an excellent job it sounds to me. I want our daughter to homeschool. Sure hope she does as I can see the many benefits. Actually, it is a way of life and quite similar to life in years past.
I hope you can convince her! Sometimes I feel like I'm not doing enough and other times I think I'll scream if we don't take a LONG break. I've found that we work well 3 months on/1 month off. The kids enjoy the "free" time and it keeps school from getting stale. Start sending her books and articles! Once you read them it's hard to avoid! :o)