The Lord said "Go forth & multiply." – He made no mention of making additions to the family.
University students; identical twins, Katrina & Elizabeth Kaufmann, were as close as siblings could be until Elizabeth broke their bond by sleeping with the Katrina's partner, George.
Katrina finally accepts she must bear some responsibility for the indiscretion. It was her who begged her twin to cover for her whilst she was doing something her boyfriend would not approve of. Before amends can be made Elizabeth dies tragically in the World Trade Centre disaster.