Is it necessary for a person co-accused in 498A to attend the court

my maternal uncle's wife has cased a 498A case against her husband and my relatives and also on my dad.My dad is a govt. employee and he got call on 11th of march 2017 from a constable to attend to court.My dad said that if he gets a notice officially,then he'll come.Again yesterday(after 7days) my dad got a call from another constable to attend to the court.So,my doubt is "is it the case that my maternal uncle's wife is wantedly making the constables to call so as to scare my father" or can it also be that the constables can either call or say verbally instead of sending a notice officially?Now if my father doesnt attend to court on monday then is there a case that my father be arrested?we are nowhere related to the case.The lady has wantedly kept a case on her husband after 15yrs of their marriage saying that my mom's family has harrassed her.And moreover they used to stay in a different state and we used in stay in a different state and my father's name is the last among list of 7