Fill out the form,

if you are inviting both parents, just fill your father's name in the "name" blank and put your mom's name in "spouse" blank. Don't sign your name at the end. Instead, bring it to notary and sign in front of him, so he will sign after you and proves that this is YOUR signature. You can get free notary in the bank where you have your checking account. Even paid public notary is only $2. You will need to bring your official ID when get notary done. Such as driver's liscence or passport.