The relationship between father-in-law and son-in-law has been subtle and interesting since ancient times. You have to be careful and prepare a gift for your father-in-law. I suggest that it is best to give a grand birthday gift to Lao Taishan.
Choose embroidery; choose hand-made embroidery. The pattern is about birthday paintings, words, etc. Then you must go to a professional gift shop. Have it carefully framed. Then take it out on your father-in-law's birthday. It is very stylish and elegant.
Otherwise, it is also good to give some more upscale handicrafts. But the handwork must be careful and exquisite, upscale. The more popular real-life imitation pottery products, tree root sculptures, etc. are all good choices.
However, before giving it out, don't forget to consult your wife's opinion. Let your wife check it. Haha.