As I have said before, unlike Iris, Bertie just isn't interested in drawing other than drain pipes and writing his name .......
...... however, the other day he proudly announced that he had drawn the cylinder in the airing cupboard in his bedroom, including all the wires and pipes!!! This masterpiece was duly mounted for display on the kitchen wall.
Although he was born four years after Grandy Andy died, Bertie is indeed his Granddad's Grandson, with plumbing undeniably his DNA, bless him!!!