No i wasnt sa pr to be frank i oveerstayed .my partner abd child ate both citizens
You overstayed for 13 years?
At any rate: you should apply under common law, the only task of significance to show that you resided together for minimum of 12 months AND that relationship is ongoing. The first is pretty standard.
The second part of that - some correspondence etc from your spouse (a letter that you are still together) and whatever you can think of, just to demonstrate the relationship is still ongoing. Listing your spouse's visits to you (and child visiting too?) would be good as well.
Keep in mind, the latter is not specifically described in application docs - but since four years not living together, just add a short letter of explanation with some supporting evidence. Not a lot, just a bit. Your partner initiating the sponsorship app will already be a decent sign that the relationship is ongoing.