My mother was born with a hole in her heart. what are the chances it will be passed down to me or my kids?

Depends: Simple heart defects have a diluted genetic effect with < 4% risk of passing a defect down(not necessarily the same defect) if the parent has a heart defect that is complex, and other family members have defects the numbers go up. You can schedule a visit with a geneticist. A family tree eval will identify any genetic issues you need to consider. Overall risk of unexpected preg outcome runs 3-4%.

Depends: Some heart defects are genetic and can be passed down. Others are not. In the case of a significant defect in your family, you may want to seek genetic counseling before getting pregnant.

<3 affects >1 person: Doctors need to know this history when seeing patients. There is an increased risk (generally 3-4%) that offspring will have some type of heart defect if there is a close family member with congenital heart defect. Risk is high enough that special ultrasound imaging of the heart by a cardiologist (for women before pregnancy if possible) and by perinatologist (for 20wk fetus) may be recommended.