If you mean sponsoring children separately, there is no 'inland' distinction. That doesn't mean they can't be sponsored while inland, just that there's only one program (doesn't matter that they are in Canada or not).
If your question is about the out of status part: that shouldn't affect the app (I think). Doesn't benefit from the specific policy about removals - but it is quite rare that they actually do remove/deport children in this circumstance. Be honest about the status, take responsibility. I think you can apply to restore status for the child - I don't know if it will work or help though, especially if it's been quite some time since out of status.
