If you have knowingly or in ignorance entered into a marital contract which is illegal or void, you file for annulment instead of divorce. The annulment rate in all the states is relatively low because the grounds for annulment are hard to prove. Pennsylvania annulment laws, like all the other states, have also tailored grounds for annulment, which are:
Bigamy or Existence of a Prior Marriage
Existence of a prior marriage is a legal annulment ground. According to Pennsylvania annulment laws, you can’t enter into another marriage while still being married to someone else. You can marry only one person at a time and existence of a prior marriage will make your new marriage void and thus it can be annulled.
Incest
According to Pennsylvania annulment laws, incest is a valid annulment ground. Therefore marriages between father-daughter, mother-son, uncle-niece, and aunt-nephew and such like can be annulled under this annulment ground.
Mental Illness
You can obtain annulment under Pennsylvania annulment laws, if your spouse has some kind of mental illness.
Physical Disability
Under Pennsylvania annulment laws, you can obtain annulment if physical disability in your spouse is hindering you from having a normal married life.