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You can either bring them here on the K1 for fiance and K2 for the step-son.
However, you would have to file the I-130 immigrant petition for your daughter together.
So is there any possibility of getting married and bringing them all here under the K3?
You file the I-130- one for each of the, wife, daughter and step-son and then file the I-129F so they can enter to adjust status in the US with the pending I-130.
That way every one is on the same wave and all would be sure to be processed together at the same time.