I starting to see a girl i am a full time single dad of 2 when should i interludes them?

i have been talk to a nice girl we have gone out a few time had a great time, we have a lot of the same interest. i am 34 and she is 28 she knows i am a single dad of two she is a full time single mom of 2. when is a good time to interludes the my kids to her and her kids and vise verso my kids really want a real mommy there mom is not really in there life 2 days a month if there lucky . i don't want scare this girl off. i don't want get my kids hopes to high.