My parents fit this to a tee.
When I was young, it was obvious I needed to live with at least one of them.
In their divorce, though it went unsaid between my sis and I for decades, she got my dad and I got my mom. Both of us felt responsible for our parents well being, so both of us continued to live with “our” parent through our adulthood.
My dad has since passed, so my sis has “her time” now. I still have my mom in my home.
Our parents are impossible, independent to a fault, irresponsible and immature. Luckily they have/had some redeeming qualities and luckily they taught us unconditional love.