Can I obtain a copy of the lawyer's notice regarding inheritance?

My father died while in service in 2019. He had another family, and I filed a case and obtained a judgment in 2022 stating that my mother, grandmother, and I are the only legal heirs. During the case, the VAO confirmed that no one else had applied for a legal heir certificate. However, now the other woman has sent a lawyer's notice to my father's office, claiming her children have the right to death benefits and a compassionate job. Can I obtain a copy of that lawyer's notice? Is there any law regarding the rights of legal heirs to obtain information about a deceased employee? Will the office stop processing the death benefits due to this notice? Please help.