« Reply #3 on: Tuesday 22 July 14 11:36 BST (UK) »
1871 census has a Joseph Harper 1830 in Bridgeton, Glasgow, retired army.
Wife Elizabeth 1842.
Children born in East Indies: Elizabeth 10, Joseph 5, John 3
Born in Glasgow: James 0
Significant age difference between Joseph and Elizabeth, so you may also want to consider whether the first 3 children may have belonged to your elusive Isabella or whether Elizabeth is the wife you are looking for.
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