Answer:
I'm an old relative who's hand's can't hold anything and eyes canβt see anything
I destroy your home from the inside out.
Weight in my belly trees on my back nails in my ribs feet I do lack.
I get wet when drying. I get dirty when wiping.
A move made popular by the King of Pop.
A mysterious, fantastic creature, It has one defining feature, And for humans at their worst, In their eyes it's just a horse