1901/Quebec/Montreal (City)/Saint Antoine
McKay, Margaret, head, b. Ont. Aug 16, 1854, Church of England
McKay, May (Mary) sister, b. Que. Aug 20, 1864, Church of England
Mullery, Margrt, domestic, b. Que. Feb 24, 1862, Roman Cath
McKay, James, cousin, b. Ont. Nov 25, 1875, Presbyterian
McKay, Andrew, cousin, b. Ont. Aug 12, 1880, Presbyterian
all are single
1911/Quebec/Montreal St. Antoine Ward
McKay, M
apt 36b, can't make out the street
head, single, b. aug 1854, age 56, Ontario
she is living by herself.
I wasn't able to find any of the others from the 1901 census under either McKay or MacKay anywhere is Montreal.