For your first follow up question, @niwiyh no, it wouldn't necessarily "flag" anything unless you were claimed as a dependent AND filed a joint return. Be prepared if your parents are audited, as @xmasbaby0 the situation may come to light.
Yes, there is a place where your husband will indicate someone else can claim you as a dependent.
- Go to: My Info > Your household > Your name will be directly under that heading if already entered, select "edit". If not, "add another dependent"
- At the screen "Tell us a bit more about [your name]" select "somebody else can claim [your name] as their dependent.
