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INTERACTION and SOCIALIZATION:
If you want your bird to be social then you, as leader of the flock must teach them! There are many species, which are indicated to be "one person" birds. This may not always be the case but it should be a consideration when you research the species best for you and your family. Use caution when socializing. Make sure those handling your bird know how to do so, are not fearful and can behave in a manner which will not turn your companion off being with others. Children should be taught about the fragile nature of birds and should be able to understand that many things in the household present a hazard to their well being. Have you heard of the child who gave the sun conure a bath?, the child who wanted the Grey to fly along with her kite?, the child who took her conure for a bike ride?. Children can and will be marvelous caretakers if you take the time to educate them!
I have read and seen marvelous stories of birds riding on dogs backs and laying beside cats and even other animals playing on the floor or carpet with them...For most of us, this is asking for a tragedy! The gentlest wonderful pet may at anytime, for any reason, do something, which can be fatal to your bird. Even a scratch or small puncture/bite from another animal can lead to an infection, which may not be able to be treated. Use your heart and your head to decide whether allowing these interactions is worth the "possible" outcome! By all means try to educate everyone in your family and allow them to interact with your pet; many loved ones in your birds' life will only add to the longevity of your bird.
MULTIPLE BIRDS:
Forgive me if what I am about to write here sounds harsh but please give this idea some serious thought and research entering multiple bird ownership! There are hundreds, maybe thousands of adoption/rescue agencies throughout the world today, which are filling up with unwanted birds. A percentage of these birds were not given up because the owners were "all" bad, hurtful, neglectful people but because they didn't count on: tragic interactions among species, time necessary to: devote to more than one bird including time to socialize, care for and financially maintain more than one bird; change in lifestyles (one bird might be fine if you had to move to an apartment from a larger home but more might not be permitted; pressure from others that no bird should be "alone"; the incorrect information that birds may be housed together happily if they are of the same species (this is not always the case, even some siblings must be separated upon sexual maturity!)
In most circumstances, you and your family will become the "flock" mates and will satiate any need your bird may have for companionship. Owning multiple birds can also be a wonderful experience but again, just research, plan ahead and know in your heart you and yours will have the time and financial means to devote to a "larger" family!
BREEDING:
If you plan to breed, education is the key to success. Contact a breeder and ask them to be completely candid with you as to the time, effort and education you need BEFORE you even begin... Please do not buy two birds and leave them together until one day you find an egg...... Check for maturity/age necessary for your species to attain before introducing into a breeding situation and speak to avian breeders regarding blood lines and proper breeding practices which will keep the species strong and healthy!
Also, remember, breeding birds are susceptible to all of the hazards our pet birds may be exposed to and may, during breeding seasons, need specifics diets and specialized care. Most avian breeders will tell you the financial rewards are low, the expenses high and time constraints exhausting, but thankfully they continue to fill our worlds with marvelous, winged creatures.