Built a swing set with help from my 4yo
Was a disaster and amazing at the same time. My son wanted to help so I let him hand me bolts and tools even though it took 3x longer. We did finally get it put together and he was so proud when his sister tested it out. Took a pic of him standing in front of it with the biggest smile. Totally worth the extra hour of work.
I love this so much. My oldest used to do the same thing when I was building stuff. Now he's 10 and builds with me instead of handing me tools. Savor this phase.