My family is from Shanxi in the north. There are always such bugs at home these days. I didn't know what kind of bug it was, so I took a photo.

According to the information you provided, I saw some photos similar to the common insects in Shanxi in the north. But because the photos are not clear enough, I can't accurately judge the species of these insects. Here are some possible scenarios:

1. Bug: Bug is a common insect in the north, which likes to move at night and is characterized by its venom stinging people. If these bugs have similar characteristics, then they may be bedbugs.

2. Ants: Ants are common insects in the north, usually living underground or under trees. If these insects have similar characteristics, then they may be ants.

3. Spiders: There are also many different kinds of spiders in the north. They usually move at night and prey on their nets. If these insects have similar characteristics, such as eight legs and webs, then they may be spiders.

It is suggested that you further observe the behavior and characteristics of these insects, or try to use clearer photos or consult local insect experts to determine the exact species of these insects.