Just a thought on Marguarite, Roberts mother was Margaret, so possibly named after her but with a 'theatrical flourish' ?
1 Apr 1866 Cathedral & Parish Church, Manchester
Robert s/o William (Shoemaker) & Margaret Owen of Manchester. Born 7 Jan 1866
1871 2 Campbells Court, Elizabeth Street, Manchester
William Owen 29 Head Manchester Shoe Maker
Margaret Owen 27 Wife Manchester, Cotton Operative
Robert Owen 5 1866 Son Manchester Scholar
1881 61 Pott Street, Manchester
Margaret Owen 39 Head Wid Manchester Factory Operative
Robert Owen 15 Son Manchester Glass House (Glass Blower?)