My Kids Won’t Stop Fighting!: How ABA Can Reduce Sibling Rivalry

By Zainab Fazal, M.ADS, BCBA

bSci21 Contributing Writer

You look at your children and marvel in their awesomeness, how they are growing so quickly right before your eyes. And then…they start playing with their sibling, gloves come off and it’s fight time! Sibling rivalry – I bet you talk to your friends about it, wish it would never happen in your home, and wonder how they can play with their friends but fight so much with their siblings!

Sibling rivalry can be challenging for parents, and can affect the entire family. Before you read on, if you are looking for a quick one-time fix or want sibling rivalry to come to end in your home, let me tell you – it is not going to happen. Sibling fights can actually be great teaching and learning opportunities for your kiddos. Moms and Dads, take a deep breath, you cannot rid your home of the dreaded fights, but you can change how often they happen and what they look like.

So why do your kids fight so much? Many of the reasons why they fight have to do with the contingencies in place – between the siblings, and with you, the parent. Like all behaviours, there are contingencies we come into contact with that either strengthen or weaken behaviours. If we have favorable outcomes, we’re more likely to engage in that behaviour in the future. If however, we come into contact with unfavorable outcomes, we’re less likely to do those behaviours in the future. The contingencies in the rivalry are what have the largest impact, and I believe the area where you, as a parent, can have the most effect. It is worthwhile, however, to highlight some other reasons why your kids might be fighting: developmental levels, sex and age, parenting styles, and boredom. It is important for you recognize all the factors for your children’s behavior that might be affecting why and how often they are fighting with each other.

You as parents can change what sibling rivalry looks like and how often it happens. But remember, it’s not going to go away completely, and that’s okay!

Step 1 – Figure out what’s going on (the contingencies). 

  1. Pay attention to when your kids are fighting. Is it always over the same game or toy? Is it always before dinnertime? Or is it when you’re busy and they have to play by themselves?
  2. Listen to them play, interact, and how the fight starts and then how it evolves. Does one child seem to be the instigator? How do the kids respond to each other?
  3. When do you step in – do you wait until the fight gets worse before you go in to parent?
  4. How do you get involved – what do you say? How do you say it, are you yelling and screaming? Do you always take away the toy or make threats that you will? Do you separate the kids? Does one child feel like his sister is being favored?

Once you’ve done that, consider how the before-mentioned quetions have an impact on sibling rivalry in your home. Where can you make realistic changes?

Step 2 – Change the contingencies.   

  1. Set them up for success – give them games and toys that they are less likely to fight over, provide more structure for younger children if they need it, and sometimes put everything away and play with them! 
  2. Teach them the good stuff – your children need you to teach them appropriate social skills. Show them how to talk to one another, how to ask for something, how to share.
  3. Teach them how to problem solve – in conflict situations, your children need to be taught how to resolve conflict. As a parent you need to teach your kids what to do when they don’t get their way, or when the younger brother doesn’t play soccer exactly how big brother wants him to. Remember, if you go into the fight zone escalated, you’re teaching them that as a response to conflict.
  4. Praise – Praise – Praise – when they are playing nicely, and getting along, make sure they know that you see it and that you’re happy about it.
  5. Give Attention – if your kids are seeking your attention, give it to them. But not when they start fighting, if they know you’ll only give them attention when they fight, that’s what they will do!
  6. Set House rules – don’t make up rules as fights come up or depending on how loud and intense the fight gets. Let kids know what the rules are in your home, and remind them of the rules before they start playing. Keep them simple, and don’t forget to change the rules (with your kids) as they develop and grow. And stay consistent!

If sibling rivalry is increasing and all consuming, you may want to consult an expert who can help design a program that works for your family. For those interested in a more clinical approach to reducing sibling rivalry, or designing a program for parents, take a look at Leitenberg et., al. (1977), who looked at two different reinforcement procedures and their effects on sibling rivalry. Take a look also at Tiedmann & Johnston (1992) who evaluated a parent training program to help siblings learn sharing skills. And from my personal favorites, when training parents and children, see my previous article on Behavioral Skills Training (BST)

In moments of conflict, remember to check how you are feeling and if you are calm enough to get involved. How you respond to your children’s fighting teaches them how to respond to each other! Here’s a quick tip on what to do when a fight breaks out:


As a parent it is up to you to teach your children how to play with others, how to interact appropriately, and resolve conflict when it does arise. Your kids are going to fight, accept it. How intense those fights get, and how often they occur, you can change. Using effective strategies in your home will make for happy play times!

Do you have a story of sibling rivalry you would like to share?  Please do so in the comments below, and remember to subscribe to bSci21 via email to receive the latest articles directly to your inbox!


Leitenberg, H., Burchard, J.D., Burchard, S. N., Fuller, E. J., & Lysaght, T.V. (1977). Using positive reinforcement to suppress behavior: some experimental comparisons with sibling conflict. Behavior Therapy, 8, 168-182.

Tiedmann, G. L. & Johnston, C. (1992). Evaluation of a parent training program to promote sharing between young siblings. Behavior Therapy, 23, 299-318.

Zainab Fazal, M.ADS, BCBA Zainab Fazal, M.ADS, BCBA, began her career in the developmental disabilities field in 2002, and has dedicated her clinical work and research in the area of Applied Behaviour Analysis (ABA). She has worked for many years in assessing and developing comprehensive programs plans for children, youth, and adults with Autism Spectrum Disorders (ASD), learning disabilities, other developmental disabilities, behavioural challenges and mental health issues. Her recent work includes training front-line staff and teachers to use ABA in therapeutic and school settings, and has successfully trained individuals for the Registered Behaviour Technician credential with the Behaviour Analyst Certification Board. She is also an adjunct professor at Seneca College teaching ABA courses in the Behavioural Sciences program. Zainab is the founder and director of Phoenix Behaviour Services, a private practice in Toronto, Canada. You can follow her on twitter @Phoenix_ABA and reach her at [email protected].

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