Criminal case

my brother's wife i.e my sister in law has filed a false 498 A ,u/s 506 IPC on me and my mother only as all the allegations are false,she has not filed any FIR on my bother
my father is no more

the local police has registered it and called us to take the notice
so wat is the next step i need to take after taking the notice
do i have to wait for the charge sheet or can i put it for quash