1.There is a custom in my family that is to say, grandparents first : Trong gia đình tôi có một phong tục là ăn cơm ông bà trước.

2.Every year until Tet, there is a custom in my family not to sweep the house : Mỗi năm đến tết nhà em đều có phong tục là không được quét nhà

3.My family always comes to Tet, we always worship for 3 days : My family always comes to Tet, we always worship for 3 days

4.The custom of my family when Tet holiday is grandparents, parents give lucky money for children and grandchildren : Phong tục nhà em khi tết là ông bà , cha mẹ lì xì cho con cháu

5.At night my house often has the custom of burning incense : Đến tối nhà em thường có phong tục là thắp hương 

It's the custom in Japan that you have to use chopsticks properly 

according to tradition, you shouldn't wear shoes indoors in Japan

There's a tradition in Japan that you shouldn't eat while on the road

according to tradition, You don't have to tip the waiter 

follow the tradition, you don't have to talk on the phone while traveling on public transport