Other forms: ottomans
Your dad's favorite cushioned spot to rest his feet can be referred to as an ottoman — it's also known as a hassock or a footstool.
This word may conjure anything from a vast empire to a footstool — it's all the same word, ultimately from the Arabic personal name Othman (which loses a lot, soundwise, in translation). The puffy footstools known as ottomans were allegedly originally a component of said empire's comforts.