Lies

Not exactly shocking news:

Many workers are willing to lie about a death in the family, illness or jury duty to play hooky, according to a survey conducted by a temporary job staffing firm.

Use uncles, not grandfathers, if a relative must "die",
You wonder why?

Because for grandpas there's a limited supply!
You only get two.

But,  when it comes to uncles, you may well have beaucoup.