I spoke to a chap today regarding Thirlwell House.
His Grandmother lived in Thirlwell House and died there in 1929. His Grandmother was Kathleen Wilson and is on the 1929 Valuation Roll, with this Janet(Jen) Currie
He remembers someone called Jen Currie (he thought perhaps short for Janet) who lived there but, can't remember much else about her. Looked at the Valuation Rolls and there is Janet Currie living in a house 1917/18 and still there in 1929. Valuation Rolls don't seem to have house names and back then, Locharbriggs was just a village.
Also back then I understand people took in people that needed somewhere to live, which could be the case with your mother and family.
Sorry I haven't been more help.
cupcake