Hi Sue,
The online IGI shows the following children for your Andrew and Janet;
JOHN
TAIT Birth: 30 SEP 1859 Bridgeton,
GlasgowJOSEPH
TAIT Birth: 30 SEP 1859 Bridgeton,
GlasgowCATHERINE
TAIT Birth: 29 DEC 1861 Bridgeton,
GlasgowJANET
TAIT Birth: 11 OCT 1863 Bridgeton,
GlasgowAGNES
TAIT Birth: 01 DEC 1865 Bridgeton,
GlasgowWILLIAM
TAIT Birth: 07 JUN 1867 Bridgeton,
GlasgowHELEN
TAIT Birth: 01 MAR 1869 Bridgeton,
GlasgowMARGARET
TAIT Birth: 17 DEC 1870 Bridgeton,
GlasgowROBERT
TAIT Birth: 20 OCT 1872 Bridgeton,
GlasgowJANE
TAIT Birth: 12 JUL 1874 Bridgeton,
GlasgowGiven that they married in Bridgeton in 1858 and they were still there for all those births, you should check the 1861 and 1871 censuses there. This may give a clue as to their birth locations.
tata
Alex