. . . (and some other people I guess). We told the girls about my current pregnancy Christmas morning with baby dolls from their "future brother or sister." We told family weeks earlier in our Christmas card (though in the end Liz knew before most of my brothers because apparently they don't read cards).
Anyway, Liz didn't quite get it at first which was reminiscent of when we told our own parents about our pregnancy with Lizzie. We gave them "I love Grandma" bibs and Drew's mom suggested we give it to his pregnant sister, Carrie. My father didn't get it either but played along until it was obvious what we were talking about.