Laurie,
I agree with Jan’s comments. Just because your mother had it that does not necessarily mean you will develop it. However, if I were you I would monitor it and perhaps have bloodwork done once per year.
My mother and great Aunt had a history of thyroid problems (they actually had goiters). I developed hyperthyroidism but did not have any gotiers as they did. My mother’s goiter devloped into a cold nodule and it was removed, however, she never ever required replacement hormone. I on the other hand was severly hyper and had RAI. I am now still trying to get stabilized on replacement hormone. Also, one other comment. I did not develop the hyperthyroidism until after my first pregnancy, however, it returned to normal within 4-5 months after birth since I took some medication. After I turned 34 years old that is when I went severely hyper which could not seemed to be controlled with medication. I also believe that stress I encountered helped bring on the full blown attack.
So just because your mother had a problem with thyroid, you might not get it, and then again if you do, you might not necessarily have the same type of problems that she had. Hope this helps.
Sandra