Am I Entitled To My Bf’s Belongings?

Throwaway for privacy. My bf and father of my daughter passed away recently. He was mostly estranged from his family besides 2 of his brothers. We moved in together after our daughter was born and a month before he passed. His name was not on the lease. His family has been unhelpful with me trying to handle things for our daughter such as the death certificate. However they want me to allow them to come and collect all of his items and car from my house and from his storage that I have access to it. I don’t want them to take everything and leave my daughter with nothing since she will have no memories of him. Am I technically allowed to keep them since they are on my property? Edit: We were both in the military. He got out in July. We live in SC.