I may be unusual but I wouldn't be offended by OP's invite plans if I didn't really know the couple getting married.
One of my old school friends invited me to her wedding but not my ex who I'd been with for 6 years living together at that point. I didn't mind at all, she only wanted people she knew at her wedding which is fair enough.
Our venue takes maximum 70 people for the ceremony and wedding breakfast and our list is at capacity. If any of my single friends or relatives gets a partner in the next year I'm afraid it will be tough luck, we can't physically accommodate any more people - plus I also only want people I know at our ceremony and meal.
Kids wise, we are only having nephews/nieces and Godchildren in the day - I was planning on telling people their kids were welcome in the evening, but most of our friends prefer to attend weddings child free anyway.