Conversation so far:
who holds the record for most clean sheets in the premier league
Petr Čech holds the record for most clean sheets kept in a single season in the premier league, with 24.
what is petr cech's current team
Petr Čech is the current technical and performance advisor for Chelsea Football Club.
when did petr cech retire from international football
On 8 July 2016, Petr Čech announced his retirement from international football.
does petr cech have siblings
Petr Čech was born a triplet. His only living sibling is elder sister Markéta.

Question: what happened to petr's other siblings
Self-contained rewrite: what happened to petr cech's triplet sister and brother