Light-hearted (kind of!) and just keen to canvas opinions.
I was at a church group a few weeks ago and there were about 20 children all playing with Lego, Duplo, crayons, paper etc. in the middle of the room.
Child A (perhaps aged 3, let's call her Julia) had made a big tower/house building. She was playing with it almost exclusively. She then turned to play with the teddy bear box.
Child B (perhaps aged 2, let's call her Hannah) then took the tower/house building and started to play with it.
When Julia noticed she got very upset.
Both parents saw this.
Hannah's parent offered Julia a different toy but did not tell Hannah to give the building back.
Julia's parents realised this so made it clear the building was taken by saying 'Did she take your building?' and 'I understand why you're upset, you spent a lot of time making that building and she took it from you'.
After a while (maybe 45 seconds of Julia's parent strongly hinting) Hannah's parent took the building from Hannah and gave it to Julia. Hannah then got upset.
So, was Julia's parent right to assume Hannah's parent should have made Hannah give the building back as soon as they saw how upset Julia was?