There's a lot of damage we do to those around us even if we tried to shield love ones. You are the person that becomes manic, or depressed it's just an enhanced or dulled version of you. As adults they're trying to set boundaries to protect themselves. Avoid arguing, try to respect their boundaries, show them your trying by participating in your treatment (this includes Intensive outpatient program or weekly therapy.), and being there for them more like a friend then a parent at this age.