Should you Tip your Babysitter?

One of our babysitters mentioned a family asked about our "tipping" policy. Should families tip their babysitters? We think that tips for babysitters are optional & appreciated but not expected.  Babysitters should expect to earn the agreed upon hourly rate for their sitting jobs and be paid by cash or check at the end of the job. Families should never feel obligated to tip their babysitters. However, if a babysitter accommodates time changes, additional kids, pets, light chores, etc. a tip is a nice way to say "thank you."