Parent Page For Blog Posts in WP

Hello gentlemen and ladies.

Question from a newbie here. On my word press website, there is a blog. Now the blog is a page on the dashboard. The problem is posts which go into the blog.

I would like them to recognize the blog page as the parent. For example, a couple of the post urls are:

http://www.kwlawoffice.ca/family-law-trials/

http://www.kwlawoffice.ca/family-law-proceeding/

http://www.kwlawoffice.ca/child-support-in-ontario/

But the Blog page is:

http://www.kwlawoffice.ca/ontario-family-law-blog/

So I’d like each of the above posts to be, for example:

http://www.kwlawoffice.ca/ontario-family-law-blog/family-law-trials/

Instead of:

http://www.kwlawoffice.ca/family-law-trials/

The problem is I cannot designate a parent page, I think because they are posts instead of pages. Is there a way I can achieve this as I’m sure it would boost my SEO if I could?

Thanks for listening and reading.