I don't have any idea what the laws might be outside the US. If I were you, I might consider obtaining local legal counsel of my own before signing anything. Not necessarily because you are in any position to negotiate, but just to make sure you are fully aware of what you are signing. Your dad's attorney probably would have a referral for you and you could have it reviewed remotely.
Ditto what legaleagle said about your dad having representation in the US if he has assets over here - he probably would need a US Will as well.
Mommy to
DD1 (12/06)
DS (6/08)
DD2 (10/11)