ShaunJ But wasn't she (Isabella) born circa 1822 ? So her mother could not be the one in the 1841 census in Glasgow, aged 25+?
You are right that doesn't make sense.
I'm now wondering if Arabella Purcell was married to one of these?
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PURCELL Bernard M 30 Private 17th Lancers Ireland
PURCELL William M 30 Private 17th Lancers Ireland
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PURCELL Arabella F 25 With 17th Lancers Ireland