I think adding hobbies and interests does support a CV and it proves you have interests outside of work. Good hobbies to mention include reading, any education you do for example, a cookery class or learning a foreign language, or even artistic things such as painting or craft. It shows you know how to relax and can even imply that you are less likely to suffer from stress.
However, I do not agree with mentioning spending time with family, particularly children. Employers can see children as a negative, even though they shouldn’t. They would never mention that this is a reason they chose not to employ you, but it can be an unmentioned factor.