After McPhee, 39, shared on Friday that she and Foster, 73, experienced a "horrible tragedy" in their family, sources tell PEOPLE that 2-year-old son Rennie David's nanny died suddenly.

Sadly, the widowed undertaker, Cedric Brown, has a lot on his plate ... Then, on a stormy night, the hideous government nanny extraordinaire, Nanny McPhee, sets foot in Cedric's household ...

With her husband away fighting Adolf Hitler's Nazis, overworked Isabel Green finds herself caught between a hectic life of tending to the family farm ... her eyes when Nanny McPhee, the ...