[PC][2011-2013] Point & Click with Ghost Children

Hi guys, please help me find this game my sister and I played long ago.

Here are some details: (not sure about all because it was a long time ago and we played a lot of similar games)

-Ghost Children I think the youngest is a girl. They sort of give you a gem (blue, green, pink) that gives you an ability that helps with puzzles like making things bigger or smaller. The children don't scare you, they sort of help you.

-Tree house with broken rope, there was alevel that has a tree house you need to fix the ladder/rope to get up (if i remember correctly this is where the pink one appears)

-I remember snow.

• one of the children (boy) wears a ivy cap I think

Thank you so much in advance I hope you can help me!