Its interesting you say that Jods, "grounded", as I think my children have done that for me, and I have a 15 yr old teenage son who lives with us from my first marriage. Kids have that innocent ability to ensure you remain grounded, especially if you want them to be emotionally happy, and not materialistic. My kids definately help with that, though I must say, I have always been a pretty down to earth person, take no crap, call a spade a spade type person. If it moo's like a cow, eats grass like a cow, is milked like a cow, chances are, its a cow! :)
I know that my little fella certainly helps me keep my own PTSD in check, because god knows, he tests me daily. I think I always remain cognisant of the fact, that he doesn't understand. He just wants dad, he just wants to explore, he is only learning, thus I have to push all my inner PTSD feelings to promote anger down, analyze them so anger doesn't come out as a result, and ensure his emotional and physical well-being is taken care off as a priority. Someone said to me years ago now, that children help maintain sufferers symptoms, often because of their innocence. We somehow, and for some reason, need that innocence to help shield us from the harshness of society. I took that onboard anyway...
Its a funny thing though children, in that I was watching Opera the other day, and they had a fathers session going, where a specialist about how to be a better father said, and I quote, "children don't care how much money you earn, they only care about how much quality time you spend with them. Teenagers don't care about how much quality time you spend with them, they only care about how much money you earn!" That just hit me right between the looking gear, because having a 15 yr old and a 20 month old, I could instantly understand what the specialist was saying.