If I was born in 2000, but my brothers in 1996 and 1999 were we all born in the same decade?

A decade is 10 years. Doesn’t matter when it starts and stops. So yes, 1996, 1999 and 2000 are all in the same decade.

Yes ,decade is standard of 10 year, in time measurement.

No, calendar troll, you were not.

Maybe you should ask your brothers this

No, you were born in the 2000s and they were born in the 90s.

Yes you were....the decade would have been 1991-2000.

Your were a year from your oldest brother.

No, you were born in the 2000s decade, and they were born in the 1990s decade.

i dont think so

You were all born within 10 years of each other. 

Specifically speaking, no since they were both born in the ‘90s while you are a 2000s-born.