I believe that all of the Gelders in the Connahs Quay area are related to the John Gelder (b1878 in Darlaston) that moved from the Staffordshire area. He moved to North Wales along with his mother Annie Gelder and he married a Sarah Ann Hughes in 1899 and they had several children:
Thomas Charles Gelder b 1900 John Gelder b 1901 Samuel Gelder b 1902 Walter Gelder b 1904 Martha Gelder b 1906 Grace Gelder b 1908 William A Gelder b 1910 Albert Gelder b 1914
I don't whether the Charles Gelder that you refer to is actually the Thomas Charles Gelder listed above. I know that Thomas Charles was married in 1934 to someone with a surname of Jones. Do you have any other details?