Due to both PIL and myself and DH meeting each other young, I have been in the fortunate position of having a full set of grandparent in laws at the beginning of our relationship. As my last remaining one is becoming increasingly frail I have been feeling reflective and wondering how common it is to have grandparent in laws. I am 43 so I know I am fortunate to have parents at my age but I have had my last grandparent in law for 23 years.