Q. See question above. Would the same apply if the forefathers were not Frum (religious)?

A. Horav Aharon Miller Shlit’a suggested that after death the departed neshamos are likely to become tahor and pure after undergoing the usual time necessary for Kaparah and redemption (one year), so they could be invited.

However, Horav Dovid Pam Shlit”a disagrees as we also find the perpetual condemnation of some souls.

Rabbi A. Bartfeld as revised by Horav Dovid Pam, Horav Aharon Miller, Horav Chanoch Ehrentreu and Horav Kalman Ochs Shlit’a.