1911 England and Wales Census
Probably:

Margaret Hislop, born abt. 1895, Newport, Monmouthshire, Wales. Resided at 71, Jones Street, Newport, Newport, Monmouthshire, Wales. Parents: Tom Charles and Catherine Hislop.
Margaret Hislop, born abt. 1896, Liverpool, Lancashire. Resided at 20, St. John's Road, Kirkdale, Liverpool, Lancashire. Parents: James and Mary E. Hislop.
Margaret Hislop, born abt. 1897, Thields, Northumberland. Resided at Park Shields, Fourstones, Hexham, Northumberland. Parents: William and Isabella Hislop.
Margaret Mary Hislop, born abt. 1901, Hythe, Kent. Resided at Rose Villia, Albert Road, Hythe, Kent. Parents: William McGregor Hislop and Mary Elizabeth Hislop.
Margaret Grace Hislop, born abt. 1906, Walsall, Staffordshire. Resided at 103, Lichfield Street, Walsall, Staffordshire. Mother: Marion Hislop.
Margaret Irene Hislop, born abt. 1907, Stoke Newington, Hackney, London. Resided at 25 Fairholt Road, Stoke Newington, Hackney, London. Parents: Abel Kerr Hislop and Margaret Irene Hislop.
Margaret Irene Hislop, born abt. 1909, London, England. Resided at 23, Kenley Street, North Kensington, London W. Parents: William and Mary Hislop.