Real Dictionary

belong
If a baby or child belongs to a particular adult, that adult is his or her parent or the person who is looking after him or her.
If a person or thing belongs in a particular place or situation, that is where they should be.
If someone belongs to a particular group, they are a member of that group.
If something belongs to a particular time, it comes from that time.
If something belongs to you, you own it.
If something or someone belongs in or to a particular category, type, or group, they are of that category, type, or group.
If you say that a time belongs to a particular system or way of doing something, you mean that that time is or will be characterized by it.
If you say that something belongs to someone, you mean that person has the right to it.
When lovers say that they belong together, they are expressing their closeness or commitment to each other.
You say that something belongs to a particular person when you are guessing, discovering, or explaining that it was produced by or is part of that person.

belong in American English
to have a proper or suitable place
intransitive verb: to be in the relation of a member, adherent, inhabitant, etc.

belong in British English
to be the property or possession (of)