I am sorry I can't help with your Reilly's, but, is there an error with your dates? i.e. Children going back to Ireland in 1939 to escape the Glasgow area bombings. If your ancestor was born in 1872 then surely his children would be mature adults, or, did I read it incorrectly?
p.s. I am researching a Reilly in Glasgow but not your Reilly's, also, I know Clydebank. That's why your message caught my eye. Good luck with your research.