I am here to be supportive.
I have three kids I have raised (28,25,22) so I know something about BP and raising kids.
Your son can get really screwed up for life, especially if BOTH parents have MI.
Don't let this happen. He should be with you 95% of the time. Either you or your husband should take care of him, not family. One of you can pick up the slack when the other is bad.
This involves (to me) taking ALL medicines as prescribed, seeing a pdoc regularly (maybe every other week) and going to any and all T's they recommend. Get in a support group. Get aggressive and channel your energy into being a great parent and staying healthy.
Your son didn't ask for this. Do your very best to stay on track. Have your husband do the same. Between the two of you, you can be one healthy parent.