OK - since the QPS did not answer my earlier request to release information I am going to put out a VERY out there scenario. Please use your time and energy to discuss this and not the colour of the Other Womans underwear and other irrelevant information!
Here goes:
ABC & GBC had decided to make a go of it after she found out about his affair/s and things had settled down again.
Allison gets pregnant unexpectedly after this 'reunion' - hence why she is looking so glowing at the Century 21 party.
GBC, hoping it is a boy, decides that his life is with his faily and tries to settle down.
In doing this he informs his mistress that they cannot go on and he has to dedicate himself to his family.
Allison treats herself to a haircut and they go out for a lovely dinner together.
Mistress drives past the restaurant, sees them thorugh the window and loses the plot. She is at their house when they get home.
A fight occurs, she kills ABC.
GBC has lost everything and is now afrain of losing his only (other) chance of having a boy and therefore tries to hide the evidence with the Mistress.
OR
It occurs in exactly the same way but NBC is furious that ABC is pregnant again - big strain on family finances in the midst of all the problems. She will be unable to bring in an income.
They get in an argument, NBC pushes her, she hits her head and she is killed.
GBC is under the thumb of NBC so acts as his clean up agent.
Is that better than discussing which school the girls should go to?