The Nan probably walks a lot faster than lazy Charlotte. Maybe the Nan didn’t want walk slow with her.Also how is it the first time her kids have gone out for a walk with her Nan? She said her nan has always walked, it’s not a new thing she has just started. If they are such a close family and live nearby then surely she would have been going with her for years, pushing the kids as babies in their prams, then toddlers going along and picking up sticks and jumping in puddles and then during covid when you could meet people outside, they still never went for a walk with her.