My T has a couple times said she realizes she's acting like she's my mom (she's my mom's age actually). But really the times I've felt possible countertransference have been when she's teared up at a couple things I've told her and seemed genuinely sad about them. She didn't seem like that during my first few years with her, just in the past year.

With my marriage counselor, I've gotten a sense of paternal countertransference a few times, particularly when he's used a story from his now-teenage daughter to relate to something going on with me. Like he talked about how when she was younger, she'd want him to come get her from a sporting activity because she was anxious. But he said he couldn't come get her and reassure her, because she needed to learn she could handle it herself. And he was comparing that to me needing/wanting reassurance from him (like that he wouldn't push me away/abandon me, etc.). At that point, I was imagining "transference" and "countertransference" neon signs lighting up over our heads!