When I came out in 2002, my parents hid the fact I was trans from my grandparents. Mom said she would let them die before they found out what I was doing. I told my mom that she has no right, and that I'd show up looking gorgeous at my grandparents house. She knew I was serious too.
So, my mom and dad drove 8 hours to my grandparents house to tell them. My mom told them it was an abomination, and perverted and wrong. My grandfather said nothing. He simply turned on his computer and started doing research. After a couple hours he came back to my mom. His exact words were, verbatim,
"It's not her fault"
My mom was livid. He didn't know my girl name, never saw a picture of me, he just knew that I was TG and went out of his way to use the correct pronoun in front of her.
Mad. My mom was effing mad, yo. She got over it, now she is 100% accepting. Especially after doing research on her own. She wants to go with me when I get SRS and everything.
I thank my grandparents for the support and research. If it weren't for them, who knows where I'd be. Research literally changed my family dynamic.