How to Explain rope hanging from tree to Your Grandparents

https://rylantkea469.wordpress.com/2019/08/07/simple-tips-on-installing-a-tree-swing-2/

Extremely sturdy, high quality swing. Easy to hang on existing swing set hooks, & no trouble to adjust the length of chains. My grands love them, & I love the way the swing seat hugs" theme securely as they swing."