If you want to see your relatives in your dream who died, do the following.

After Esha Salah read

Darood/Salawat 11 times

Surah Shams, Wal lail, Wad Duha, Alem Nashra. All 7 times each

Then Darood/Salawat 11 times. Without talking to anyone go to bed and sleep alone in a room. You will see them with in 7 nights. Most people saw their relatives the first night. Please make sure your clothes and bedding is clean.