For Jackson's birthday (December 23), we went over to Grandma and Grandpa's house. My mom made us dinner, we decorated sugar cookies for Christmas, opened presents, and had cupcakes.
Tyler's birthday (December 26) was also low key. He opened his presents first thing in the morning.
You'll notice he recently discovered Star Wars. After watching all 6 movies in one weekend, he officially loves it. Hence the Star Wars slant to his birthday.
I made him his favorite dinner, stromboli, and then we had cousins over for cake and ice cream.
Both boys were happy at the end of it all.