Could you take the kids to your in-laws and then leave from there? It would be odd staying at someone else's house for two weeks. Maybe they would feel better about it if they were in there own home.

We wouldn't feel comfortable with someone we didn't know. The nanny would have to be someone who had been around for a ling time. I'd persevere with family. Though saying that none of my family would look after my DS for that long unless there was a medical emergency.