I would say "the ability". When you say "an" ability in this context, you're referring to a specific ability and it sounds odd in the singular. It's like saying:“In my opinion, a large number of parents don’t have an ability to bring up children properly.”
Is the underlined part correct?
Have you got any suggestions to express it shortest?
Use "the ability" instead of "an ability". "Don't have the ability to" = "can't". "Don't have an ability (needed) to bring up children properly" sounds like you are about to specify one particular ability that they will need for bringing up children.Do you mean that I should use "the" and "abilities" in my sentence?
This has a much more negative connotation. It means that they don't deserve even to be taught to bring up children.Hi, sunkitty.
Is "fit" suitable too?
"They are not fit to bring up children"