IIRC, Rebecca and her sister were taken to an Urgent Care facility by the CPD......I seriously doubt that XZ would have known/been aware of where Jonah's older children were at any given time. IMO, what ever happened to Max, XZ was in the shower and didn't see/hear anything..........after the scene was "staged", and Jonah had convinced Rebecca to lie for him (and the teens) and departed to the health club, Rebecca screamed for XZ to call 911........Let's think about how long this all took: my guesstimation is about 15 minutes. I do believe that Jonah drove to the Coronado Hospital, where Max was taken to initially, but I do think that he returned back to Spreckels, or perhaps to Howard Luber's home just around the corner to pick up the teens and take them to the airport.........XZ would not have known any of these details.