I can really relate. When my niece was three, and first came to live with us, my two year old daughter and her fought all. day. long.
It was very, very trying.
We are 17 months into it, and while they still have moments here and there, they are consistently playing and sharing with more ease; They really enjoy each other's company.
*Mostly* I think their conflict had been a phase of development and transition. Nonetheless, there were a few things I found really helpful - especially for my sanity.
- Unstructured outdoor play time. The more exercise and room my kids had to run, laugh, scream, and play, the more relaxed and easy to get along with they became. We go to the beach and look for treasures, or play dragons in the woods. Now, I can just get them into their galoshes and send them into the yard without me (I can supervise from the window). It was like magic - because while we were out running around, *I* got a break from their fighting and we just had fun.
- Negotiating their differences. For a few months, I jumped in during their debates and I would speak for them, "Opal, did you feel frustrated when Cacia took the book you were holding? Then we can use our words and *ask* for it. It's not okay to scream, even if we're feeling frustrated," and then I'd lead her through it, "Cacia, when you took my book I felt frustrated and sad. Please give me my book back." And then I'd talk to the other one, "Cacia, it's not okay to take something when someone else is playing with it. How do you feel when Opal takes something you are holding? Sad? Opal felt sad when you took her book too. You don't want Opal to feel sad do you? You need to say sorry and give back her book."
Now, I can say, "Hold on, use your words," when they begin bickering, and they'll catch themselves (much of the time).
- Like you, we also did timeouts as punishments. Hitting / hurting wound them up in their room immediately. Most other things I would give a warning, count to three, and then send them to their room for a few minutes or until they stopped throwing a fit (fits are - at this point - disciplined with a timeout and a conversation.)
- Alone time. For them AND for ME. We do weekly / biweekly dates with each of them, where one will go with one parent and the other with the other parent. The next week we trade. We would do something special, one on one.
ALSO, I had to have time to myself. I set up child care trades with my close friends so that I had their children for a day, and then they'd take mine. I would clean, go grocery shopping...or do nothing. It was glorious. Really, really, really important for my sanity.
- Not sweating the small stuff.
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I'm sending you hugs and tea. I can really sympathize. It sounds like you are doing a brilliant job, and I'm sure this is just a phase.