I have bipolar disorder type 1. what are the chances of me passing it on to my children. my grandfther had bipolar type 1 aswell.

Available studies: Genetic transmission of bipolar disorder is not complete -- your children do not automatically develop the disease that you have. Some studies have shown that with 1 bipolar parent, there is 15% risk in kids' developing the illness; with both parents, it goes up to 30%. So there's a greater chance that your children won't be bipolar, than that they will. Healthy lifestyle helps too.

Bipolar disorder: There is a good chance that bipolar disorder can be passed on to your children.

Stats: From the literature: 35% chance if one parent has it. 75% if both parents have it. These are the probabilities. Keep in mind that a more stressful environment will play a major role is pushing these probabilities forward. A more stable environment is always protective against gene expression of any genetic vulnerability. Take care.