I too find it really disconcerting when children, no matter how old, refer to their parents’ by their first name. It is just weird and disrespectful to me. I was talking with my neighbor’s son the other week (he is my age), and he kept referring to his dad by his first name. It threw me for a loop and I started wondering if I misheard their relationship for a sec. it seems to me that many children who call their parents by their first name come from divorced households and the parent starts being a “buddy” to the kid as a substitute adult relationship. That is just my amateur psychoanalytics though.I’ve known parents who made a big point of wanting to be their children’s friend rather than parent, who pushed the first name thing really hard. It was weird.