Grandson is 2 Rena ,which would be best for him as Christmas presents?
Probably the Critter books, Umpa. There are two of them -- Lemur Troops & Critter Groups and Stork Musters & Critter Clusters. Each book contains 21 short rhymes teaching animal congregations. Most kids know a group of lions is called a pride, but not everyone knows what a group of giraffes are called or a group of turtles, etc. These are great for younger kids because each page is a different animal with just one short rhyme on it -- not a long, drawn out story or anything.
The illustrations in the Critter books are super cute! They were drawn by Nikki Boetger (she went by Shoemaker for the first book). You might have seen some of her work before if you shop at Costco. There are these great big workbooks called The Learnalots and she illustrated them. She did the first 2 books in my Critter series, but I'm having a different illustrator do the third (and possibly the fourth, if that goes under contract). Anyway, Nikki's drawings are adorable and I'm sure your grandson would love the books.
The Marshmallow Man is basically a retelling of The Gingerbread Man story, but with all new characters. Someone gets eaten in the end, just like the original story, so that's always something to consider with the younger ones. My boys think it's hysterical, but they're weird to begin with. In fact, the book was originally their idea! There MIGHT be a sequel to this one someday. Hee hee!