Edwards joined the Manics after designing the cover for
their first single in 1989
The sister of Manic Street Preacher Richey Edwards is due
to give evidence to the UK's first parliamentary inquiry into missing
Rachel Elias will call for a Presumption of Death Act,
making it easier to register a person dead.
Her family finally registered the Blackwood musician
presumed dead in October 2008, 13 years after he disappeared on February
The mother of missing Madeleine McCann will also give
evidence to the inquiry.
Kate McCann will call for greater support for the
"heartbroken" families of missing people, four years after Madeleine
went missing in Portugal in 2007.
Ms Elias, who supports the charity Missing People, will
focus her efforts on trying to establish a Presumption of Death Act,
which would allow people to be presumed dead after seven years of their
The session will focus on whether current presumption of
death measures are fit for purpose.
There has been a similar law in Scotland since 1977.
Ms Elias said it took her family four years to obtain a
court order to declare her brother dead in 2008.
She told BBC Wales: "It was very difficult.
"There was no advisory organisation out there to help us
to know what to expect.
Elias wants more rights for the families of missing people
"It was difficult enough for us, and for families who
have wider issues to deal with such as dissolving a marriage or dealing
with joint assets, it's an even more difficult process."
She said Missing People wanted to "challenge the current
system in England and in Wales for presumption of death provisions".
On the current system, she added: "It's an absolute mess
at the moment and an act would really help and benefit families."
Ms Elias and the Missing People charity are also calling
for long-term missing people to be checked against a national database
of unidentified bodies.
Many believe Richey Edwards took his own life at the age
of 27, and his car was later found near the Severn Bridge.
After his disappearance, Ms Elias said the family
"searched, did everything we could, contacted everyone possible really -
made an active attempt to find him and there was just no out come and it
continued like that up until now".
She added: "At the time, the police weren't particularly
helpful and I think that was possibly not their fault.
"He had a public persona. I think they drew an opinion
about him that he had the right to go missing, that he was a young man
man and that he chose to go.
"I think the police possibly didn't realise that it it
was more complicated than that, that he was also a vulnerable adult and
maybe they couldn't see beyond his persona."