Disclaimer - I love talking about relationships but not all the time.
Also kids etc is quite boring to most people unless they're your own. So yes if there is something significant or there are issues but otherwise shouldn't feature that much beyond the early years.
I talk about psychology, politics, tv shows, music, books, writers, artists, work (depending on who it is - if appropriate), the environment, animals, countries, languages, language, history, games, dogs, plans for nights out/trips, family, house buying/car/decorating/kitchens if any of us are buying, skincare, exercise, diet, food, recipes, crafts, mutual friends, other friends, reminiscing, clothes, workouts, exercise, culture, business, adverts, sociology, anthropology, tv series, alternative medicine, normal medicine, gardening.
Loads of stuff. Conversation is very important to me and I am constantly learning and wanting to learn new things.
I know some lovely people but there is only so much time I can spend with them before requiring more stimulating conversation. I am friendly and open and find it easy to talk to people though.