I doubt that an advert was involved in an example from my wife's tree, clarified recently. Her uncle had married in 1933 and a daughter arrived late in 1934. Both parents then decamped from Tyneside to London, leaving the child with mother's parents, who adopted her in 1945. The mother divorced and remarried (new husband could afford it, apparently) in 1951, then re-adopted the daughter just before her 19th birthday. Some unlucky people could be adopted more than once !