Bittersweet Love

Bittersweet Love is a 1976 drama film directed by David Miller his final film, written by Adrian Morrall and D.A. Kellogg, starring Lana Turner, Robert Lansing, Celeste Holm, Robert Alda, Scott Hylands and Meredith BaxterBirney.

Patricias parents have never met Michael, and are out of the country, therefore unable to attend the wedding. They meet their new soninlaw after returning from their travels. While reviewing pictures from the wedding she missed, Patricias mother is shocked to discover that she knows Michaels father he is also Patrcias father, the result of a brief tryst between the two many years before. Therefore, a newly married couple learns that they are halfsiblings, with a pregnancy already underway.Distraught over the news, Patricia goes to her doctor to see if she can obtain a lateterm abortion. The doctor tells her that if the fetal weight is still low, they may be able to terminate the pregnancy due to her situation. Patricia ultimately decides not to go through with the abortion, but is still weary of her relationship with Michael. ........

Source: Wikipedia