Margaret Montague Head M age 24 born Dumbarton Carters wife Catherine age 6 born Dumbarton Mary age 4 born Dumbarton Margaret age 1 born Dumbarton Andrew McGuigan (Brother) age 22 born Dumbarton Riverter Journeyman Patrick McGuigan (Brother) age 18 born Dumbarton Shipyard Labourer No sign of Henry
There's no Hugh and Teresa in Dunbartonshire Nearest I could get was a Hugh and Terrancia in Renfrewshire They do have a son called Daniel aged 5 and six other children ranging from 8-24, but all of this family were born in Ireland Sorry, can't help with 1891 census