The only correction I'd make is to delete this -- "It has always been that way; they just never seem to have any trouble with life."
I doubt if that's a factual statement.
The rest looks good.
ok, so i didn't spend much time on it, but here's what i got for the introduction: ( please correct any grammatical or any other mistakes )
An only child has it all! No problems, no worries. It has always been that way; they just never seem to have any trouble with life. This is the same with almost every child around the world who doesn’t have any siblings. Although there are some down sides to being an only child, I believe the bright sides are more. There are many reasons why life is easier for an only child. An only child has many advantages not available to a child with siblings.
2 answers
ok, thanks