A few questions

You could set both the parent website and the child blog to publish on the same place.

For instance, I am having a parent website whose "Website URL
" is:
http://www.servicespan.net/

Under it I have 3 blogs, one of them being set to publish at the same URL ("Website URL" is http://www.servicespan.net/).

When you do this, and if you keep the main index templates from both the parent website and the child blog, there is a risk that you overwrite the home page with the one from the other place (if you want the blog one, you could accidentally overwrite it with the parent website one or the other way around).

If for instance you don't like to get your blog main page be accidentally overwritten by your parent website, you could either remove the parent website "Main Index", or even better, you could set the parent website to physically store the files in a different server path that your blog.

For instance, you could set your parent website "Website Root" to publish at:
/here-goes-my-server-path/_ignore

Doing this, means that the parent website if it would ever publish something, it would do it inside the "_ignore" folder, while the blog is set to publish at:
/here-goes-my-server-path/

Which is the place that is called by the domain name, in my sample, by:
http://www.servicespan.net/

Both the "Website URL" and "Website Root" publishing paths could be found under: Settings -> General, for the parent website, as well as for any child blog.

Kind Regards,
Mihai Bocsaru

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