At the park a few nights ago, I was holding Eleanor and we were watching Phoebe go down the slide. Every time Phoebe would slide, Eleanor would start kicking her legs and laughing. Phoebe said "Mommy, I think Babinor wants to go down the slide too". I tried to explain that Ellie was too little, but Phoebe promised to help and to be very careful so I decided to give it a shot. I put Ellie on Phoebe's lap and held on while they went down the slide - Eleanor LOVED it. She giggled and giggled and giggled.
After a few rounds of that Phoebe said they didn't need my help anymore and they could do it by themselves "just sisters, no mommies" is how she put it. In retrospect, this could have gone horribly awry, so maybe it wasn't my smartest parenting decision ever. In practice though, Phoebe was very careful with her sister and very proud of how safe she was being. Eleanor, had a great time.