Chapter 1 Observations and Questions

So for my five observations, I noticed that:

• The only person who shows any sort of emotion to the suicide attempts is Mrs.Lisbon.
• The lack of emotion towards any of the events in the story emphasizes the fact that Mrs.Lisbon is emotional.
• Instead of at all addressing what was going on with Cecilia, Mr. and Mrs.Lisbon keep a close eye on her, loosen the home rules a little bit, and act like it never happened. They also do not talk about it with anyone which not only shows a lack of ability to interact and help their own daughter but also shows that they are ashamed.
• Considering the other girls' reactions to Cecilia's first suicide attempt, they're attempts to spend time with her after the fact, and they're general attitudes in comparison to Cecilia's make it particularly hard to believe that the other four have the same emotional troubles to the extent where they would attempt suicide (unless there is a sudden random and extreme change in each of their lives).
• The fact that Mr. and Mrs. Lisbon chose to throw a party "for" Cecilia shows not only poor parenting with Cecilia in particular because they should have been able to see that their daughter does not succeed well in these social situations, but bad parenting in general that their way to try to "fix her" was throwing her a party with a bunch of people they use to be too strict to let the girls interact with. 

My questions are:

• What is the big importance with the number 13?
• Why do Mr. and Mrs. Lisbon more or less keep their daughters on lock down their whole life and then suddenly decide to allow all sorts of strangers in their home?
• Why is everyone so aggressively intrigued with the lives of the Lisbons?(To a creepy extent)