BÃ la was often ill when he was a child . When he was seven his father died and his mother took him and his sister to live in NagyszÅ ` lÅ ` s ( today it is called Vinogradiv and is in the Ukraine ) , and then to Pozsony ( today it is called Bratislava in Slovakia ) . BÃ la 's mother then took him and his sister , Erzsebet , to live in NagyszÅ ` lÅ ` s ( today Vinogradiv , Ukraine ) and then to Pozsony ( German : Pressburg , today Bratislava , Slovakia ) .