This is a difficult age. I think my twins are about the same age as your grandson and they have also been very jealous of each other lately. I try to play lots of funny games that involve contact (think
Playful Parenting), and give them a name so the kids know how to ask to play. Here are some examples of our favorites:
• Tickle Bee: I point my finger, pretending it is a stinger, and hold it in front of my nose while circling it. Then I chase them around while making buzzing noises, occasionally I will catch them and pretend to sting them. Remember to breath if you try this one, it is very easy to get caught up in the buzzing and forget.
• Secrets: Whisper in their ears; usually nonsense but I will also tell them “I love you.”
• Rock-A-Bye Baby: a classic nursery rhyme but my kids love it. Maybe this would be very therapeutic for him if he could pretend and see what it is like to be a baby held in arms. He is probably very curious.
I would also suggest making special plans with him and go do something new and exciting. One of our favorite places to visit is the pet store, which they seem to like as much as going to the zoo. We are fortunate to have an exotic pet store nearby that has open cages and allows them to touch the animals which is why I think it is such a huge hit.