Man child? #thinkingoutloud

My SO is a man child. I really don't think he was raised properly. He acts like a teenage boy in many ways. I have arguments with him I expect to have with our son in a few years. He is really trying become a better person I can see that every day but sometimes its hard because I feel like I have a toddler and a teenager I'm rasing. I know we will all be ok eventually. Its just that the growing up part is hard sometimes I guess.