Both the original Dutch series (The Ludwigs (2016)) and the American remake (Hunter Street (2017)) use the same sets.
The show is based on a Dutch series called "De Ludwigs".
Was originally titled "Hunters to the Rescue!".
Erik and Kate adopted Nika when she was a baby, Tess when she was 5, Daniel when he was 12, Sal at 5, and Max at 13.
The reason Erik and Kate adopted 5 children is because Erik was adopted when he was younger and wanted to pay it forward.