François-Xavier Roth (born 6 November 1971 in Paris) is a French conductor. His father is the organist Daniel Roth. His brother Vincent Roth is a violist. Before turning to conducting, François was a flautist. Roth graduated from the Conservatoire National Supérieur de Musique, where his teachers included Alain Marion and János Fürst.
His sister is a violist.
The context doesn't mention if he even has a sister much less if she is a violist.  But, he could have a sister and with the musical genes that run in this family, she could very well be an accomplished violist.
( z1 violist :domain ( z2 person :ARG0-of ( z3 have-rel-role :ARG1 ( z4 he ) :ARG2 ( z5 sister ) ) ) )