Generally speaking, it is not a big mistake to buy food suitable for the elderly, such as delicious high-grade fruits and exquisite snacks with good taste. There are not many of them, and there are more patterns, which are easy for the elderly to accept. There must be many gifts, but not too miscellaneous. The number of gifts must be sufficient, and the price need not be too high. You must have one or two gifts to by going up one flight of stairs.
On the other hand, if the elderly usually love health care, then ask your girlfriend what kind of health care products she likes best, buy high-end ones and send them there. The elderly will definitely like them. Such old people are easier to get along with.
There are also cultural people, who are usually in contact with higher levels and like calligraphy and sports. It is also good to buy some pen and ink or small sports equipment, such as table tennis rackets and badminton rackets, but the cost is higher.
Supplement: If it is fashionable, it is absolutely good for your wife to help you choose a set of cosmetics or jewelry!