Just let her do the talking. If she turns him down twice and he’s still persisting then you step in. It’s your girls job to draw the line and your job to defend that line if crossed.
This should be the 3rd or 4th time that I would be posting this scene.
Though, I always tell my son that I love him. But I believe that in this movie (fences), Denzel was telling his son that he loves him, without necessarily using the word "love".
Very sweet scene.