To cut a long story short my parents separated just before I was born. We lived with my mother and didn't see our father again. We then moved to the uk when I was 8. In this time we never had contact with our father or his side of the family.
For years our mum told us he was disinterested, had another family and didnt want us. Which we believed. It transpires that he refused to let us move to this country, she eventually paid him £££ to sign the documents permitting her to bring us. Dad passed away when I was 15. I only found out in my late teens. When we questioned her about why she didn't tell us sooner that he was dying she said we were too young to understand.
Now today I get a strange email from someone who tells me that they are my uncle and that they've been trying to get in contact for years. He informs me that my grandfather also died last year after a long illness. 
I it UR to expect my mother not to spend years lying to me/us? The really sad thing is I wished I had met them both now I guess I'll never get that chance.