I'm not Sheri, but we do have a Jack Russell. We got him the end of August at about 8 weeks old and he has wrapped us all around his little cute self. We have an 11 year old DD (you don't say the ages of your kids) and I also do home day-care for 4 year old twins. Honestly I probably wouldn't want one around kids that young or younger. I only have the day-care kids here part-time (3 days a week) and they also leave for pre-school several mornings a week... so he is not around them a lot. But when he is, it is a lot of work. Being a puppy he is still in the nipping stage and I don't want that to happen, so I watch him like a hawk around them. He does love the kids, and likes being around them, I just don't trust him quite yet not to nip at them.
Our DD loves him to death, and at first he was nipping at her a lot, but as the weeks go by he is really calming down. We did puppy classes and now he is in beginner obedience classes, that really helps a lot. He is turning into a little lap dog, he loves to sit with us whenever we watch TV or are at the computer. He is incredibly smart and learns things in one sitting. We have already taught him the basics... sit, down, shake, high 5, stay, roll over, come and speak and are so looking forward to all the new stuff he can learn.
My nephew and his fiance have a Jack Russell as well, only a little girl. She has been calm since the day they got her and our Dash has always been a lot more fiesty than her, I don't know if that is the difference in sex or just that she is a little angel.
Hope this helped a little, good luck in your decision making.