D.D.
I totally understand your situation. When my son was 11, I remarried and 2 more boys. My ex pulled a lot of similar and different stuff just to cause problems at our house. It wasn't easy. The one thing I can tell you that I did was sit down and have a heart-to-heart with Jared when the little ones were asleep. That way we had no interruptions. We put the rules down in writing and we all had input in the rules. That way, Jared had a say in the matter. I told him that I'm his mother the rest of his life whether his Dad likes it or not. While in our house, there will be cerain things that will not be tolerated. When things go as they should, everyone gets to enjoy a few extra perks. When Jared chooses to disobey or misbehave, there were consequences. We decided together on the consequences so we all knew what was going to happen. My situation was very complicated.
You are not being mean or too hard on him. He is 11 years old. Around 10-12 is when children need to be held more accountable for their actions. It's the in between stage of their life. They aren't a little kid anymore yet they aren't a teenager either. If you continue to baby them, that is what they'll expect and take longer to grow up. If you set down the rules on paper and copy them for each person (reduces the I didn't know answer), it helps. We had a weekly family meeting to go over chores, homework, attitudes, and would try and resolve any issues. It helped with Jared.
We still had issues come up. The consequences changed as he got older. His senior year, we had many tough love consequences. Jared was mad at me for a long, long time. A lot of it was because he expected something for nothing. I told him he would understand more when he gets out of boot camp. He went in the Marines 7-24-06. I'm expecting to meet a young man when I go to his graduation in October instead of the 19 yr old little boys that left in July.
Do not despair. There is a book called Easy to Love, Difficult to Discipline at Barnes & Noble. Excellent book. It has tons of great strategies especially for the 10-12 year old transition age. Believe it or not, letting them participate in making the rules helps give them some control. Trust me, we aren't giving them the control over the situation but we are giving them some control over themselves and their actions. Giving them choices is another awesome tool. The book goes over that in great detail.
Example - by 6 and 7 yr old boys at the park. I tell them when we get there that we keep the rocks/pebbles on the ground. If you throw them, then you are telling me you want to go home. Do we understand? They say yes. Sometimes I have them repeat what I said back to me. There have been a few times when they've thrown the rocks. I tell them that we are going home and to get into the van. When they start to cry, I tell them the discussion we had when we arrived. They chose not to listen so they must not want to play at the park today. The next time we go to the park, we have the same discussion. I remind them of what happened last time. They need to make better choices. They may think I'm mean when we have to go, but I remind them that I'm not the one who threw the rocks. They chose to throw the rocks.
I hope that helped.