I was inspired to write this, after watching a wonderful Romanian guitar trio - the Zamfirescu Brothers (and sister - which is the best out of them )
I have seen them perform in 2007 at the International Classical Guitar Contest, which took place in a nice Romanian mountain resort. I was simply smashed away by what they could play, separately and together as a group. The girl is by far the most amazing out of the three
Now, which famous groups of brothers/ sisters do you like? They can be a good example too: