Neerman jee.. you will need following documents for your family:

1.I-94 forms of both of them

2.Copies of passports

3.Daughter's birth certificate ( I presume she is not married)

4.Your marriage certificate

5.Copy of your H-1 approval from

You can fill up the ' request for change-of-status ' form yourself after downloading it and save around $500 in attorney fee.

Good luck!