Cry with them. It's all they know and at this point, it's all you know.
Repeat everything they "say." It's confusing for them, fun for you. Little kids love to be mocked and laughed at!
The minute they start the usual complaining, interrupt with a story about the time when they were little and ran around naked in front of guests yelling, "Look at my pee pee! Look at my pee pee!" Nothing like an embarrassing trip down memory lane to open communication.