Coming immediately to mind....Oversized floor puzzles, lego (duplo has larger pieces that might be best for siblings so small), memory game (so many different themes from batman to curious george), candyland, chutes and ladders, washable dry erase markers with dry erase boards/coloring books (letters, numbers, etc). DS is big into imaginext toys and rescue vehicles of all kinds.
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We have decided that we are not going to give big presents to DS since he gets so much from everyone else. When he turned 3 we bought him 3 books and an outfit, then we took him to the ice cream shop & got ice cream. He loved it Not to mention he had a big party!!
Re: What to get a 4 year old boy?
Those trucks that come with tools/drills to take them apart/put them together.
Stomp rocket
Matchbox cars
Boogie Board tablet
and for us at least - anything batman