Update: Vacation planning vs real

This year I (m48) went on my first holiday with the children ((m9,w3) alone (information: here, here). This is new after the separation and was previously an unknown item. Otherwise we had always shared the costs but one less adult does not represent 50% savings. I roughly tried to include everything obvious using fixed items and approximate values (daily flat rate for everyone). My Excel table shows me €1259.45 I had set a limit of 1200 for 8