If he lost his job, and will be home, then why would they even need a nanny now? Plus their finances will be shaky so it would make sense for the dad to care for his kids.
Even if they keep you on, it will be a much different dynamic with Dad in the home all day.
Working alongside a stay-at-home parent can be quite daunting to say the least, so please consider this new dynamic when considering what to to.
Good Luck!!~