This LEGO Ideas set includes 4 minifigures: mom, dad and 2 children, plus a bird figure. This challenging, 3,036-piece building toy features a landscape base, tree with interchangeable sets of green (summer) leaves and yellow and brown (fall) leaves, and a LEGO Tree House with 3 cabins - main bedroom, bathroom and kids' room. The treetop and cabin roofs are removable for easy access and play. Landscape base features a buildable picnic table with 4 minifigure seats and assorted elements to create a picnic, plus a buildable stream, swing (hanging from the tree), bonfire, hidden gem element, plant and bush elements, and a ladder to the cabins. Tree foliage features over 180 botanical elements made from plant-based polyethylene plastic using sustainably sourced sugarcane. Assorted plant elements around the tree are also made from this plant-based plastic. This is the first milestone in LEGO Group's ambitious commitment to make products using sustainable materials by 2030. Main bedroom cabin features a buildable bed, and assorted elements including hidden scissors (as a reference to the fan creator's day job as a hairdresser), ship in a bottle, compass, clock plus a balcony with a hand-operated, wind-up crane to lift items up to the cabin. Bathroom features a buildable bathtub, toilet and sink. Kids' room features bunk beds and assorted elements such as a book and treasure map.