LOL
Are the Holloways and the Twittys working together to find Natalee? I've never seen the father & stepmother in company with the mother and stepfather, and none of them have even acknowledged the existence of the other in commentary.
I'm wondering if there is bad feelings brewing. Maybe the father is upset that Natalee was allowed to go on this trip in the first place. If the stepfather sent her off with a wad of cash then perhaps there is an ongoing vying for her attention.
If they aren't working together then that is just one more roadblock toward finding her.