Not necessarily. If it can be proven that the defendant caused physical harm to a family member without that family member being present then, it is not necessary for the victim to appear in court. Additionally, if the victim fails to appear then, the state can request a warrant to hold the victim as a necessary witness in order to force the victim's appearance. Also, if the victim received a subpoena and fails to appear then, the victim can be held in contempt of court for failing to appear.
Domestic violence is a serious crime that has potential penalties beyond the immediate consequences at sentencing. If you are charged with domestic violence then, you should consult and attorney immediately.