What's the name of this movie? The living role should be a grandfather, a grandmother and three children! The name tiger! Fat! There's another one I forgot! this

Aguo and Xiao Hu are young, but because they live in seclusion in the mountains and are taught kung fu by their ancestors, they all have good fists and fists. Four people, grandparents and grandchildren, live a happy and isolated life. Unfortunately, San Xiao accidentally let grandpa's beloved pet lark go. In order to avoid being punished by his grandfather, he decided to go down the mountain to find his grandmother who lives in a big city. Three children have never been to a civilized city at the foot of the mountain. So after arriving in this international metropolis, they are curious about everything, and at the same time they are constantly making jokes. Because the old banknotes brought by the three children can no longer be used, and there is no clue to find their grandmother, the drug trafficking group, wandering the streets, pretends to take care of them and wants to use them to commit crimes. The third primary school didn't check it at first, but later found a conspiracy, so it escaped and met grandma. Unexpectedly, the drug trafficking group took away the criminal evidence by the third boy and was afraid of being seized by the police, so they took their little granddaughter in exchange. The third boy went to negotiate privately and had a big fight. However, his time was wasted by guns. In an emergency, grandpa arrived in time and saved the fourth boy from being killed. At this time, after grandma called the police, a large number of police arrived and brought a group of gangsters to justice, and the five grandchildren finally got together happily.

This is a series of movies with 10 episode, which I watched on VCD when I was a child.