I’m glad the OP said ‘Olden days ‘ and not ‘good old days’.
Usually a cooked breakfast, then not being able to go outdoors on a Sunday (unless it’s to go to Sunday School or Church) it was catch up on homework ready for school on Monday.
Always a roast lunch followed by a fruit pie that Mum would have baked, whilst listening to ‘2 way family favourites’ we all loved that, eating lunch in the kitchen, the only warm room in the house.
Special occasions we ate in the dining room where a fire would be lit to thaw the room out.
Sunday afternoons was Sunday School then I was allowed to read a book until tea time, sandwiches, fruit and homemade cakes.
Then ‘sing something simple’ as someone else said , music to be endured, in the Summer it was easy to escape to the sitting room (in Winter it was too cold) and read, until bedtime and school the next day.
When I was older we had a Dansette record player and Mum would play her Jim Reeves records all afternoon, there was no escape, if it was sunny I was allowed to sit in the garden under the tree and read.
No cleaning or housework/laundry/ shopping was ever done in our house on a Sunday.
I hated Sundays apart from Mums lovely roasts. But I read masses of books!