Bowing to parents

Question: Is it permissible to perform Rukoo‘ (bowing) to one’s parents?

Answer: This is impermissible and is tantamount to Shirk (associating others with Allaah in His Divinity or worship). Rukoo‘ is a form of worship, just like Sujood (prostration); therefore, it is impermissible to bow or prostrate before anyone other than Allaah the Exalted… read more here.