I am being charged with child sexual abuse and molestation when I did not do that. Would it be necessary to hire a lawyer?

The answer to your question depends on a number of factors. First, have you actually been arrested or indicted for the abuse or has your stepdaughter simply filed charges? When charges of such abuse are filed, they will be investigated- often be a special sex crimes unit within the police force. After the investigation, if sufficient evidence is available, you will be arrested and tried in court for various sex crimes including child molestation, rape, lewd conduct, or various other charges. The penalties you face could range from 30 days or several years in prison to life in prison, depending on the severity of the charges brought against you and where you live. For example, in Georgia, the average child molester serves six years in prison. You may also be required by law to register as a sex offender if you are convicted, upon your release from prison.  Regardless of whether you live or what stage the investigation is in, you should get help from a criminal law attorney immediately to protect yourself from these serious charges against you.