The Friedkin Group Lead Machine Learning Engineer interview questions

Third party recruiter reached out on LinkedIn was trying to fill the position. First round was hiring manager interview which was focused on resume and cultural fit. Final round was in person back to back interviews with hiring manager, two directors and CTO. Final round focuses on white boarding, resume based past experiences. Interview with CTO was weird as he asked if was married and had kids. I have never been asked that question before in 8 years of interview experience. I have been an interviewee myself and there are guidelines on the extent of personal questions you can ask during interviews so it definitely seemed weird. They did not extend offer and decided to keep me in loop for other roles but later ghosted me. They ended up hiring experienced candidate with double my experience which makes me wonder why they even called me in for an in person interview.