It’s not all conflict with Corwin and Charles. A couple of days ago they were playing together by running around downstairs. Corwin would run away and duck behind something after which Charles would wander over giggling and saying “I see you!”. Corwin would run away and they’d repeat the whole process. Charles always enjoys any interaction with his big brother.
Charles really enjoyed it a while back when I got some inflatable bats and we all pounded each other with them for a while. Even though Charles got pounded the most he still had a great time, frequently falling down because he was giggling too hard.