Jealous? You bet. It’s a normal way for him to feel because he’s a normal human being. A friend once gave me a good analogy. It actually applies more to bringing another child into the family, but I think you will see the application.
Suppose your husband came home one day with another woman, and said “Honey, I’ve decided to bring home another wife. She is moving in with us today. She really is very nice and the two of you will grow to love each other in time, and it will be so fun…” HOW WOULD YOU FEEL? Betrayed? Angry? Scared? Suddenly the world as you knew it was shattered! Wouldn’t you be afraid that your husband didn’t love you any more? What about the things in the house that are yours? What’s going to happen to them? What’s going to happen to you?
Your little guy needs daily reassurance that he is loved, and that he is still your very special child. Hold him on your lap a little more often and help him to know that you will always have time for him, etc. If you put yourself in his shoes, it will help you to know what to say to him.
Also, when the other boy is not there, get your son to express himself about how he feels. An excellent book about helping another person to do that is "I Don't Have to Make Everything All Better," by Gary and Joy Lundberg. They teach a technique that VALIDATES feelings, and DRAMATICALLY improves relationships in children, with your spouse, or the lady next door, or a cranky sales clerk, or….
When your little boy feels more secure in his relationship with you, the altercations with the other little one will not be as frequent. No, this will not completely solve the problems, but it will go a long way towards smoothing things over.
Here are a couple of customer reviews about the book from Amazon.com. (No I am not gettind any kind of pay off by recommending this book. I’ve just seen what the results can be.)
“As a father of four, ages 10 - 2 the two things I liked most about this book are; First, after talking about a principle, it gives real-life examples of what works (or doesn't work) in family situations. Second, it's giving me a chance to have my kids grow up in a validating atmosphere. I will never say "you're not mad," or "you don't really think that" again. Someday my children are going to write a big thank-you note to the authors. :-)”
“Validation has changed my life. I have just finished reading "I Don’t Have to Make Everything All Better", It is one of those "I'd wished I'd know it then", things. I have a difficult 17 year old, validation has literally given us back a relationship. I also taught the concept to my 21 year old son and his girlfriend in their struggling relationship. I saw a difference in their attitudes over night. I can't begin to share with you all the stories that validation has given to me. Thank you so much for your efforts in writing the book and bringing to light what I have found to be truth.”
Good luck!--K