How should I handle my relatives who disapprove of breastfeeding?

When my relatives know I am still breastfeeding my kids despite they are already over 2 years old, they will give all sorts of comments and opinions. I just smile and did not argue with them as I know what I want for my kids. I just replied he/she is not ready for weaning yet. There is no point to rebute back and hurt the relationship. Ultimately it is my own choice and I am very happy with it.