Quick back ground - I have been a single mom to 3 young men (27, 20, and 18) for the past 18 years.  My SO has been the only parent to his children (Son 27, Daughter 19) for the last 9 years.  We met and began our relationship almost 5 years ago.  My kids have accepted the relationship (not at first) and have come to truly love this man!  His daughter has fought the relationship from day 1.  She feels I have taken away from her relationship with her father (hence the name "The Other Woman").