When my cousin died I sat in a corner and red the Lord of the rings. Not because I was sad, but because I hated groups even if that group was my family. Don't be afraid to take time to be alone. I was in the same room as them, but it was a big room so I could be by myself. This allowed me not to get overwhelmed, but still have people there if I needed them. So if needed distance yourself and if anyone asks just say I can't handle groups right now. I wasn't sad because of my cousins death, but rather everyone else's emotions in association with it was overwhelming, and I hated groups.
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"Once you eliminate the impossible, whatever remains, no matter how improbable, must be the truth."
Arthur Conan Doyle