Hi, Your mother Elfrieda Augusta DaCosta - nee KLOSE - pev. married surname
FERREIRA - passed away - in 2007 - What Date - What location Burial Location
Was an Obituary published
That may show names and locations of other family members - perhaps friends - at the time.
What was the Given name for Mr DaCOSTA - your stepfather - Is he still living ?
He may be able to assist with some information - names of friends etc