Don't Swear in front of the kids

On the birth of my daughter, I made an effort to curb my colorful vocabulary, quite successfully, I thought, until the following exchange between Mom and our three year old caught my attention:

Mom: Jane, sit down for dinner.

Jane: I need to go upstairs and tell Poppy we are home.

Mom: Jane...sit down.

Jane: I need to tell Poppy.

Mom: Sit down; he already knows we are home.

Jane: No he doesn't. I just heard him say !@#%@ and #%@!*.

* Expletives omitted.