my wife is looking for her brother

my wife is looking for her brother My wife recently found out that her mother ( now deceased) Mary Claire Usas ( maiden name) married to Jean Guy Bignell, then married to Zigmus Burksaitis, had a son either a couple of years before my wife was born ( May 1952) or a couple of years after. He was born at St. Mary's Hospital Montreal and given up immediately for adoption. May now be in New Brunswick.Mother was from Lithuanian background. brother may have serached and found mother over 10 years ago but she did not want contact. Any info or assitance would be appreciated