one day, take just one shoe of the pair of shoes of your father and hide it in the attic.
next day, take away his watch and hide it somewhere.
third day, take away his spectacles and hide it somewhere.
like this, daily take away some item of his and hide it somewhere and return it to it's original place the next day.
let him be busy searching....then after one week tell him that you were exactly similarly tensed when he continuously contacted your acquaintances regularly....
he is very concerned about you and so such harmless tricks by you will make him understand that you are now an adult and do not like interference.