Yes, you can use Form I-751 to remove conditions on residence for your children. However, the following circumstances should be taken into account.
Dependent children who became conditional residents the same day or within 90 days of the parent should be included in the joint petition, namely in Part 5 of Form I-751 of the parent seeking to remove the conditions. In this case, it is required to include a separate fee and supporting documents. You must file your petition with a copy of your permanent resident card or alien registration card, and a copy of the permanent resident or alien registration cards of your conditional resident children that you are including in your petition. Submit copies of both front and back sides of the card.
And if you have dependent children who did not acquire conditional resident status during the above-mentioned time frame, or in case the conditional resident parent is deceased, your children must each file Form I-751 separately in order to remove the conditions on their residence.