What's the deal with jawbones?

Anonymous
I noticed in a picture of a family I know, both the kids had weak jawbones, but both the parents had strong chiselled jawline

What's going on? Will their jaws grow as they age? One son is 22 whilst the other is 18 so surely they should of grown into it by now? I have a similar problem and I just dont understand?
Whats the deal with jawbones?
What's the deal with jawbones?
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