i have had a single parent adoption a few times before. It has been a while though, Hopefully your couple will be compatible with each other. I wish you luck!

I've had that happen lots of times. I had one woman adopt three little kids before I finally found someone nice for her to grow old with.

You can read much more about this in the following topic:
Adoption before marriage

I've personally never had it happen but I would definitely adopt a child each time I get the option to do it

Has anyone had a single parent that never got married but had adopted kids and therefore was able to start another generation?

I have a single parent of 2 adopted kids and she is 38 (still young for the most part)- I haven't found her a suitable partner yet. Am I OK as long as the kids make it to college? Or should I be worried and take one of the next marriage proposals?

Yes, you are fine. You don't have to get married in the game as long as you have adopted kids to take over.
(Did I beat Lys in posting this? LOL)

Just so you know: I just confirmed a theory I had.

If you want your single peep to adopt a child before marriage, you just have get a peep that "definitely" wants to have a baby and let he/she stay single for a couple of years.

That happened 3 times for me.

My fourth try (for the sake of the theory) was to start a family with a "not really" wanting a baby peep. She stayed about 10 years single and with no adoptions.

Interesting Moonlyght. I am one of those terrible people that does not adopt kids, although I have a few times. Both the kids I adopted were 3 years old when adopted and total terrors. I might try it again since I feel bad sending the adoption agency away when they come knocking.

1 of my male peeps No Way wanted kids. He's 26-28 years old (started him yesterday) and today he adopted a little girl. I have another male whose child status is Definitely wants kids and when he got sick his Dr. consult informed me that he'll be needing Baby Boost if he wants to have kids.