I guess I was lucky, my oldest brother was DXed back in the 60's, so after my parents were educated, and my dad accepted it,they had no problem accepting it and me, but after all my ancestors have a history of it.
Mom accepted my brother's DX, but it took dad awhile, the fact that it was due to chemical imbalances and meds adjusted that, dad lost that old fashioned mental pic of some sort of early century assylum thing.
If possible try to educate them, above the posts here are some references/resources that may help.
If your medical center(s) in your area have a behavioural health dept., they can even help with literature, and even some group support meetings for the families of those who suffer with a mental disorder.
I wish you luck, and patience, it takes time.
Sincerely,
DE

BTW
Welcome to PC's Bipolar forum, as well as PC.