Face blindness?

Hi. This may sound weird but I’ve noticed over the past several years something strange that happens when I am with the people I’m around the most. It doesn’t happen with strangers. Its not happening consistently, but once in a while I’ll talk to someone for a period of time and I’ll stop recognizing them? I know logically that they’re my mother or my brother, but it’s like something’s been disconnected. I haven’t told my loved ones about this and when it happens it’s a bit jarring but I just try to suck it up. I have history with depression and (social) anxiety and I have brought it up with my therapist in the past. They were concerned but we never went back to the topic since we were also dealing with several other issues that I am now healed from. This is just one of the few things that still bother me. Is this a delusion?