SB - thanks for your post. Your family sounds like mine - of my three siblings, two have thyroid disease (one also has a couple other autoimmune diseases) and the third never goes to the doctor!
A medical recommendation for you - if you haven't done it already, ask your doctor to check not only your thyroid levels but check you for thyroid antibodies. Although the presence of thyroid antibodies doesn't guarantee you will develop clinical disease, it makes it far more likely - and if I had a patient with a family history like yours and positive antibodies, I would be a lot more suspicious of any thyroid levels that were near the "border" of normal.
