sure you may use " easy going" or "out going" for describing the personality of cheerful people: - Celine is an easygoing buddy; I enjoy being with her. - my mother is in charge of the shopping in our house not me. ;) Being in charge of sth means to have a responsibility to do sth.

Yes, you can. In fact, 'easy going' describes a person's personality in general; 'relaxed' describes how a person is acting at the moment (only temporary). And you should say "I'm the one in charge of the shopping at my house." or "I'm the one in charge of grocery shopping." Example: "She is generally so calm and easy going. But yesterday when I saw her sitting in the park, she was upset and didn't look very relaxed."