Wow.
I hadn't thought about Concentration since I watched it with my own grandmother back in the 60s -- but seeing the illustration here brought all those memories flooding back!
My mom dropped me off at my grandmoter's house from time to time -- not every day -- but it sounds like my Grandma's House experience was a lot like yours.
I spent a lot of time camped out on her sofa while she got stuff done around the house but when her favorite show came on -- for her it was Queen for a Day -- she joined me and we watched together.
Grandma and tv meant comfort, love and security.