have somebody's interests at heart
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.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
have somebody’s (best) interests at ˈheartwant 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.
Farlex Partner Idioms Dictionary © Farlex 2017