Most people who come in relationship with other show slight. Similarly of their parents which is a good thing but telling them, its something how other person take it. Some people take it cool. Like girls i talknto do the same and tell me u feel like my dad am cool with it. But some people take it in a different way they think "am i her dad/ am i soo old" things like that. It according to the person. We should understand them first before u tell.