@serhii The most important person in your life is your own self. A healthy loving parent is what your child always needs not a distracted struggling parent who is exhausted.
@serhii The first con should have been more than enough. You shouldn’t even had to write it down. But the fact that he needs to be told leads us to the 3rd one… wow! Like you said “fool me once…”
This could easily turn the other way. Don't assume they'll play. I never played with my sister, but we physically fought non-stop. If you look around, there are other cases like this where siblings always fight.