I am a sister. Can the house I bought let my own sister get married?

You can't. Because some places will think that it is unlucky for my brother to regard his wedding room as someone else's wedding house, and he will take away all the good luck in the house.

Generally speaking, according to social customs, my sister should get married from her parents' home, that is, her own family. Some people will become monks from relatives' homes or brothers and sisters' homes because they have no relatives, but that is very rare. But there is not so much pressure now, and blood relationship is more important than everything.