My mother has had 24/7 home care since September. The weekend aide has been there since then. The weekday aide has been there for about a month. Neither of them celebrate Christmas, but it seems like I should give them an end-of-the-year tip. How should I go about judging the amount based on the time they've been employed. We like them both. (A week's pay is obviously not feasible since it costs a fortune.) Thanks.