How should we express love to our parent?

nowadays, more and more children don't know how to express love to their parents. it may because the children now would think that showing love to their parents is not necessary, but actually, our parents are willing to feel their children's love. we can say 'i love you,dad/mum,but you don't have to, people may feel uncomfortable saying 'love' ; sometime we can give them a hug, a kiss, or buy a little gift for them to show that you love them,all of these will make them happy. as i can remember, it was my mother's 40th birthday, I bought a silk scarf for her as a birthday gift, and give her a kiss, she was really happy and almost teared. I love my parents.