How wonderful your father still has his sketches, Liz. It would be very hard to deny his genes wouldn't it? That looks to me like a big cedar log being hauled out of the forest. Not many of those around anymore. Bravo your father, great drawings. I love the donkey too.
More proof to my theory that artistic ability is genetic. Your dad's work is beyond the pale, Liz. I love his style and his subjects in these drawings. Perfect for book illustrations too!