Welcome to the site :cool:
Thanks for setting up your User CP and updated information relating to your location. Grab a spot on the couch and tell us a bit about yourself. How long you have been riding, what kind of riding you prefer, where you are located, etc. We will do our best to hook you up with some fellow dirt bike enthusiasts.
I am going to hazard a guess that it is a PW50, which is good for kids to learn on, but it may be a bit small for 9 year olds. I gave my 5 year old grandson an XR50 for Christmas and expect him to be on an 80 by the time he is 9. They will enjoy will learning on the bike but should quickly outgrow it.
On another note ... Twins are TOTAL fun ... mine are 32.
Again, welcome to the site and shout if you have any questions!