I posted details in another thread

It's a mix of a premade cat tower and a home made topper reskinned in green carpet.

It's a Hexagon Happystack 3-story Cat Tower base (lower 3 tiers). Then I made the top tree top tier out of 1/4” MDF cut into 6x 10.5x33" triangles, combined them with 30" continuous hinges, got a couple green indoor/outdoor carpets (base is grey) from Lowes and cut the fabric and put it in with heavy duty Velcro tape.

Today we are going to velcro ornament shaped catnip toys to the tree.

Yeah, they're all brothers. They still wrestle with each other, but they're great. We introduced 2 other foster kittens to them and they welcomed them in with no issues.

Jojo is the mom of all three. We were just going to get Jojo as a pregnant foster mom, then Meatball got on her cage and they asked if we'd take him. He was the only surviving cat from her first litter in the colony. We ended up quickly foster failing him. Then Jojo had her 5 kittens, we foster failed Marty and Emmett and adopted out the other 3.

Meowy Christmas from, top to bottom, (Son of a) Meatball, Marty Seamus McFly, Dr Emmett Brown (bottom) and Jojo.