1) Yell at the client (two of them yesterday - but they are 'semi' family).

2) Bill the hell out of 'em.

3) Fire them.

4) All of the above.

UNLESS there's a really good excuse.  One I'm finishing today only because his wife of 25 years dropped dead in March.  He's a mess.  And she (of course) was the one who always gathered the paperwork.