One of the big problems with research in this area is that it still is unclear if it the actial Bipolar disorder that gets inherited or if it is the way that a glitch int the nerve/biotransmitter system is expressed. You can carry the gene for this glitch like your sister, and if it is not triggered in the right way, you won't display the disorder. Your brother may have it triggered at a different time or a differnt way and only have depression. You child my be triggered the right way at the right time and develop full-blown Bipolar disorder. He'd have the gene from you, just as you and your siblings had it from one of your parents, who may have never been triggered, either. Another of your children my present with Aspbergers, which also implicates the way that signals are transmitted in the brain (among other things we do not understand).
NO, you cannot inherit insanity from your children, inspite of all the bumperstickers to the contrary. They just drive you crazy purely by themselves