。。
This is my older brother. He's cool, right?
Literal
This [topic-は] big-brother [copula-です]. Cool [copula-です-agreement-ね].
A family introduction. Note that 兄 (without さん) is the plain/humble form used when talking *about* one's own older brother to others — Japanese distinguishes strictly between humble family terms (for your own family) and honorific ones (for others'). Without context, この in 'this is X' is often used with photos or in video introductions rather than referring to an actual person present.