Dad Grabbing His Daughter

May be its just a bit of fun between my husband and my daughter, I would like an opinion, she has always been very much daddies girl I don't get on with her very well, I have noticed him come up behind her and grabs her tits saying things like these are a fine pear they are coming on nicely you should be proud of them and they would look much better without bra, she doesn't complain she seems to like it, should I dad do that to his daughter. or is playful fun. or am I wrong. somebody tell me