When I started looking I kind of decided most therapists would not comprehend where I'm coming from because I have "no family." I just said this repeatedly in my therapy, "I have no one, no family" to really hammer this point home. By that I mean I have no siblings and both parents were different kinds of abusive and or abandoning, so I've felt very alone my whole life. I'm not around any other "family" either, aunts/uncles. I think almost everyone has at least one family member they can say they communicate with regularly, and I do not. I was worried a therapist wouldn't get this, but I decided after a few sessions the first one I saw did get it. She was actually more keen to what my problem was than I was, she's the one who told me about complex trauma and pointed out just how damaging my childhood was. To this day I have no idea if she's single/married, has kids or not, was an only child or has many siblings. I just don't know anything about her, but I did feel like she at least comprehended how alone I felt. My current T in contrast has a big family, and I think he still "get's it" intellectually but I doubt he's ever felt anything like I've felt my whole life. I've come to learn about his family very gradually, and I will say I am jealous, but in another respect it's nice to see/ hear about a healthy family. So I guess my point is you might find it doesn't matter, but if you want them to understand that about you I would just repeat it several times early on.