you need buy certs from general registry (see www.gov.im) - might also be worthwhile checking is she or husb left a will (again general registry) - there are several Devereau families around Douglas (big in fish curing + retail) the manx telephone directory is online - might also be worthwhile looking for BMD's in local press - the IoM Times upto 1964 is available (pay for) via larger libraries as digitised in Brit Library scheme