I agree. Someone I know has been in two long term relationships with women with kid(s). The relationship he had with the kids was just as important, probably moreso in the end, than the woman. It's a tough gig to take on, but a super rewarding one.
True that, I did wonder if she was confused because he put the ring on the engaged / married finger but didn't make any reference to it - it was like she was waiting for him to ask!
Other than that, with a traditional family, I wonder if they might already be married.