have (one's) (best) interests at heart

To be primarily concerned with what would benefit one. I know you don't agree with some of the decisions I've made, but you have to trust that, as your mother, I have your best interests at heart. Despite what they claim, we know that the board doesn't have the students' best interests at heart—they're just looking to make money! I just think it's foolish to place such blind faith in elected officials without asking whether they have your best interests at heart.

have somebody’s (best) interests at ˈheart

want somebody to be happy and successful even though your actions may not show this: As a father, he always had his little girl’s best interests at heart.

have somebody's interests at heart

have (one's) (best) interests at heart

have somebody’s (best) interests at ˈheart