Thank you for your patience.
Ohio has very specific grounds for divorce. There are of course 'no-fault' grounds of 'incompatibility' and living apart for a year. That type of a divorce is typically faster, less acrimonious, and cheaper. It also tends to affect the children less but it requires that you both agree on all parts of the divorce and you essentially let go her bad acts.
But Ohio also permits 'fault' based grounds under ORC - 3105.01 which I have provided below for review. Most likely you are considering "Fraud" and "Neglect" and those seem to fit. The fact that she granted access to your financial records to strangers and is effectively embezzling funds into her business, as well as committing forgery makes those grounds legitimate. Likewise you may even want to consider pressing criminal charges as she is stealing from you, and possibly from your employer.
Now, as far as the children, you would need to attack her 'fitness'. Fitness factors may include a history of abuse or neglect, domestic violence, drug use, alcohol abuse, history of mental illness, criminality, or moral turpitude. For that I would strongly urge you to consider retaining counsel, both for your peace of mind, and the peace of mind of the children.
3105.01 Divorce causes.
The court of common pleas may grant divorces for the following causes:
(A) Either party had a husband or wife living at the time of the marriage from which the divorce is sought;
(B) Willful absence of the adverse party for one year;
(D) Extreme cruelty;
(E) Fraudulent contract;
(F) Any gross neglect of duty;
(G) Habitual drunkenness;
(H) Imprisonment of the adverse party in a state or federal correctional institution at the time of filing the complaint;
(I) Procurement of a divorce outside this state, by a husband or wife, by virtue of which the party who procured it is released from the obligations of the marriage, while those obligations remain binding upon the other party;
(J) On the application of either party, when husband and wife have, without interruption for one year, lived separate and apart without cohabitation;
(K) Incompatibility, unless denied by either party.
A plea of res judicata or of recrimination with respect to any provision of this section does not bar either party from obtaining a divorce on this ground.
Effective Date: 10-06-1994