So many what ifs:
- What if you're among the last to deboard your transatlantic flight? That could take 15 minutes.
- How quickly can you and your small children walk/run to catch the 2nd flight?
- What if your transatlantic flight is late?
- What if the Gdansk flight closes 15 minutes before departure? You won't even have that 50 minutes assuming you're first off the plane.
Assuming your itinerary is all on one ticket, if you all miss the connection, how many flights are there to Gdansk for the rest of the day? What if they can't get all of you on a future flight that day?
I wouldn't do this itinerary if I were alone.