First, you yourself are a dual status alien.
As a dual status alien you would file a dual status return, which is not supported by Turbotax.
However, since you were a resident alien at the end of the year you can, together with your spouse, choose to be treated as resident aliens and file a joint return. Bot h of you would have to report worldwide income for the entire year in this case. You would need to attach a statement making this choice and an application for an ITIN for your wife, unless she has one or is eligible for an SSN or already has an SSN. Regarding your children: If they will become resident aliens in 2015, you can make the first year choice for them once they meet the SPT. The first year choice would make them resident aliens starting the day they came to the US (so they would be dual status aliens for 2015). You can then claim them as dependents and claim the child tax credit (you would answer on Schedule 8812 to the question if the meet the Substantial Presence Test Yes and No and attach the statement making the choice to the return).
