Be excited about what excites your child.
When your child raises up his chubby little arm pointing to the light above for the ump-teenth time that day, delight with him. He is thrilled with so many things in this moment! The light is cool, but even more, HE KNOWS WHAT TO CALL IT! And he can USE THE WORD ALL BY HIMSELF! Be boisterous in your response back to him, "Yes!! LIGHT!!"
When the chatterbox in the backseat has been talking non-stop since you buckled in, let your voice communicate delight. Be thankful that he wants to share every thought WITH YOU more than anyone else. And if you must quiet him, do it with grace: "I LOVE hearing all about this, but can I stop you for a moment? It's time to order my coffee and I need a moment to think first."
When the distracted one wants to tell you something RIGHT NOW, even though you just asked him to go clean his room, pause a moment and listen and enjoy his thoughts. He knows just as well as you that this thought will be fleeting and if you make him go clean his room first and THEN tell you all about it, there is no chance he will remember what was in his head 15 minutes prior.
Matching the excitement of your kids is good, but it is also so helpful to kids to mirror other emotions as well. So when he is frustrated that he STILL can't tie his shoes and he pounds his fists on the floor, don't get mad at his anger. Instead be frustrated alongside him, "ARRG!! Tying shoes is SO HARD!" And when little brother hits bigger brother for the 100th time and he falls on the floor crying - not because he is hurt physically but because it is SO HARD TO PLAY WITH A TWO YEAR OLD - be sad with him! There is nothing more soothing than having someone to share your strong emotions with! Be that for your kids sometimes!