Inviting Sos of friends?

So I have 2 friends and we all lived together once before and invited both of them to our wedding. Both of them have long term boyfriends (dating for 2 years +) but I only invited one of their boyfriends. The reason being is that my FH and I have stayed at that friend's place multiple times when we come visit and have met/hung out with her BF each time. As for the other friend, I've only met her BF once and don't really know much about him. Because I invited the BF of one of them, I feel like I should invite the other. She asked for a plus one but I told her that depending on the RSVPs, I will let her know if there is room. Seems like a fair reason but should I have included her BF to the count from the beginning?

For those that already had their wedding, what % of guest accepted the invite? We are also trying to see if there is room for the children of our guests as well since my FH and I work in the children's department in church (1.5-5 year olds) and we would love to see them at the wedding too! Currently, we only counted children of our family and those that have children over 10 years old. But then I feel like I should let all my guest bring their children so its fair.