I just recently started looking into genealogy and came across your post. If you are still looking, I have found a lot of info on Ben Ironmonger's brother Joseph's family. Seems they moved to Beverly Hills California. I believe some of Ben's children did as well. Check the California Social Security index.
I am a desendant of their sister Mary Ann who married Joseph Gray.
Could you please let me know if you find anything farther back?
I have found an obituary of Joseph Ironmonger from Jacksonville, Illinois that hints at some of their past.
Thanks,
Eileen