The newly wed wife said to her husband when he returned from work:

- I have great news for you. Pretty soon we're going to be 3 in this house
  instead of two.

The husband started glowing of happiness and kissing his wife:
- Oh darling, I'm the happiest man in the world.

But then she said:
- I'm glad that you feel this way since tomorrow morning my mother moves
  in with us.