I fully agree with Stitch and everything they mentioned, everyone must be on board to have a bird. Everyone should accept that their lifestyle might change. The mess, the dust, the shouting. Also accepting they might have to constrain the dog or the cats somewhere. Worst one is when you tell them not to let the dog near your bird (I know my dog pretty much almost killed my parrot), but your family just shrugs off with "they will be fiiiiine" and next thing you see is a horror scene because your family did not listen to you, or because it was too bothersome for them to keep the other pets in the separate room closed while your bird is with you.
Honestly having parrots is a whole new level of having pets, I had a whole zoo before at home from mice, fish, hamsters, cats, dogs, parrot. It is not easy. Sadly the parrot was closed all the time because according to my parents "he was just fine, see, he is alive" and because of the dog. For them it was much more "humane" to keep the bird in a tiny cage than keep the dog in another room. To this day I still argue with my parents because I gave away our life pet who was with us well over 20 years just because I wanted a better life for him. He spent his well deserved 4-5 years of pension happy with other parrots and still among humans who loved him dear.
Parrots aren't nearly as obedient as dogs, and will always look for trouble. chewed up furnishings, poops everywhere. Keep the bird closed all the time, they will let you know they're not happy, with loud shoutings (even a cockatiel can have annoying very loud shrieks, all parrots can be very loud to a point)
If one person in the family is absolutely not willing to have a bird, it will be chaotic. By accident doors or windows left open, dog in same room as the bird while it is free, perfumes, areosols, etc... Getting a bird means you have to change your lifestyle quite much. I can ensure you that a single bird can take more time of your life than cats, dogs and any rodent combined... Also add a bird to the whole zoo, and you have quadrupled the work because you have to monitor all the time. Some people can juggle between many pets along with bird, but it is never easy..
I agree if you can go and volounteer in a parrot shelter, it should give you some idea how it is. And as Stitch mentioned, you can forget about going anywhere for a holiday or sleeping over if noone is home to take care of the bird... And taking the bird along is much more difficult than tagging along the dog.
Wish you all the best!