A source close to the family told RadarOnline.com: "There's plenty of people in the family who want to talk right now, but with the feud between Julia and Nancy being so public, everyone is scared to say anything.
"If they speak, they'll surely be banned from attending the funeral. Above all, the family just wants to be there to pay respects to Nancy."
An insider previously admitted that Julia's troubled relationship with Nancy was made worse by the former production worker's addiction.
Nancy, 37, regularly launched public attacks on her famous relative on Twitter but friends insisted they were often triggered by the actress' pleas for her to seek help in rehab.
The source added: "Julia is taking the death very hard. It's extremely difficult for her because it didn't have to happen."