Quote Originally Posted by new1
Most parts of india first cousins and brother/sister are almost interhangable.
The situation is similar in Russia.
brother - брат (brat)
first cousin - двоюродный брат (dvoyurodnyi brat)
The word двоюродный (dvoyurodnyi) is often omitted unless you want to specify. Though I think if one is telling someone about his family for the first time he would specify.