Father's birthday is a big deal for children. Although it is not a big birthday, since it is the birthday of an elder, congratulations should be given. It is also a courtesy. Here are some suggestions for gifts:
1: Business gift. Since father is a businessman, he must be very particular about his clothes. You can give him a new tie. Whether the tie given by your own children is good or bad, I believe he will like it very much.
2: Give him a creative gift. You can make a real doll of him, or of course you can make it look like the whole family together. Put it on his desk, which will definitely make him feel very warm and more energetic at work.
3: Give him a poem. Since the business makes money, the value of the gift is not actually what parents care about. It's better to show your intention. Write a poem for him and recite it at the banquet. I believe your father will be proud of you.