What Happened to Gordon and Elizabeth Moffatt

Around 1928 Gordon and Elizabeth Moffatt lived at 4510 Uber Street, Philadelphia, USA. At this time there is no mention of children, wondering if they had any and what became of them if they did. Last listing was the 1930 Census, they were living at the above address, they were both 60 at this time. Elizabeth's name before marriage was Elizabeth Catherine Webster. Gordon and Elizabeth came from England. Wondering what happened to Gordon and Elizabeth.
Cheers, Robyn