According to most regional customs, the first time a girl goes to a man's home, the man's parents are expected to give red envelopes to show their sincerity. But it also depends on the will of the man's parents, some parents do not necessarily give red envelopes, may give gifts, or because they do not like the girl, will choose not to give red envelopes and gifts.
1, according to the custom
Generally speaking, it is the custom to give red envelopes in most parts of China, and the amount of red envelopes can be interpreted to some extent as how much the man's parents like the woman. Of course, it also depends on local habits. Some regions give red packets when they first meet, some regions give red packets when they are engaged, and some regions give red packets when they are married.
2, according to personal wishes
Some families, even if the parents like the girl, will not necessarily give red envelopes, may give gifts, such as buying a set of clothes for the woman, or buying a piece of jewelry for the woman. If, of course, the parents like the girl. If you don't like it, you should probably treat it as a casual friend of your son at best.