If you feel like criticizing, shut your mouth and keep it to yourself. Don't wait for the big occasions to celebrate the little everyday milestones in their life. Know how to make your love really felt. Sometimes we love people, but we don't know how to convey that love so that they really feel it. To really make a person feel your love, you have to understand what this person values and how they interpret love.
Some people feel loved if they are hugged often.
Others feel loved if you really listen to them. Some people feel loved if you show that you are part of their lives, by participating in certain events or occasions, or simply keeping in touch. Others feel loved when they see something tangible, a meal, a present, a bouquet of flowers. Try to ascertain what will make the people you love feel loved. Keep your word.