The provincial holiday was brought in by the governing Liberals under former premier Dalton McGuinty and was first celebrated in 2008.
Here's a rundown of some of the things that will be open and closed on Monday:
Schools, libraries and public transit
Public schools in Toronto and all city-run libraries will be closed on Monday.
The TTC will provide holiday service on Family Day, which means all routes will be operated as they are on regular Sundays — though service will begin at 6 a.m.
A small number of Metro grocery stores will be open in Ontario on Family Day. In Toronto, the Metro at Yonge and College will be open all day. But all of its other stores in the city will be closed.
Most Loblaws stores will also be closed in Toronto, though the downtown store at the former Maple Leaf Gardens will be open from 7 a.m. until 11 p.m.
All of the LCBO retail stores across the province will be closed on Monday, as will all LCBO offices.
The same goes for all Beer Store outlets, which left the organization reminding customers on Twitter to “plan ahead” for Monday.
Toronto Eaton Centre will be open from 10 a.m. to 6 p.m. on Family Day.
Out in Etobicoke, Woodbine Centre is closed, though its food court and Fantasy Fair will be open from 10 a.m. to 6 p.m.
Yorkdale Shopping Centre, Sherway Gardens and Fairview Mall will be closed on Family Day.
The city’s outdoor skating rinks are open on Family Day. The city's website lists the specific hours for each rink.
The Toronto Zoo will be open from 9:30 to 4:30 p.m.
The Ontario Science Centre is on regular hours on Family Day.
The Art Gallery of Ontario is open, with the gallery hours running from 10 a.m. to 4 p.m.
The Royal Ontario Museum is also open.
The CN Tower will be open.
The Ripley’s Aquarium will be open from 9 a.m. until 9 p.m.