my dad have interest on my wife

I'm married m(28) and my wife 23 ..she is beautiful and good bodyshape ... ...she always notices that someone is watching her ...she always wears shorts at home so she looks kinda sexy and i always notice that my father's eyes gaze her thighs..he is being so touchy with her.. sometimes he touches her waist and say you are getting fatty.. sometimes he bought her clothes... etc...one day my wife getting change her clothes for a party...and i was out ...he came our room without knocking and open the door and saw her in bra with pazama ...many such things were happened...but all these things makes me excited I don't know why but i like it.m