One thing that I have learned in life about dogs is that there are no two alike. Scout is very different than Nash, and yet each is a wonderful dog. Scout is Mr. Personality, life of the party, always in front of the pack. Nash is a quiet soul, staying by my side, unsure about his place in the world. Being Border Collies, both are quite biddable, loveable, and intelligent, but their personalities are total opposites. Not a bad thing, but they are a good example of how no two Border Collies are alike.
That is also true about writers: no two alike. Each of you approach words differently. Think of the police when they gather witness statements: everyone has seen the accident in a different light. Each of you interpret uniquely. That is the great thing about writing. You can write your family story and your brother can write your family story and these two works will probably be quite different from one another. You each see the world through different eyes.
One word of caution: if you write non-fiction, it is EXTREMELY important that you ascertain that your facts are correct and report them as such. If you interpret, make sure that your reader knows that this is your opinion, not fact. So much of reporting today is opinion and not fact, and this does distort true reality. However, even if you are writing non-fiction, the way you write will be unique to you.
I point this out because it is very important that you, as writer, allow your voice to be heard. You need to let it ring through. Although you have read the great writers, and it is important to learn from them, it is also important that you use this knowledge to strengthen your own individual writing. Do not imitate other writers. Readers can tell when a writer is not being intellectually honest–the writing becomes hack, dry, and lifeless. Interject your special influence on your words. Let your soul come through. Be unique.