TOD - When my sister was telling us how much she loved digging into genealogy, our mother said, “Don’t dig TOO deep.” We figured that meant either:
A) She suspected a secret and didn’t want to know, or,
B) She knew the secret and didn’t want us to find out.
A couple of years later she casually mentioned to my niece that my father had fathered a child while in the service at the end of WWII. Now, mind you, by this time she was convinced there was a swimming pool outside her dining room and that a young couple used her couch to make out when she wasn’t in her room.
So, my sister and I may, or may not, have a half-sibling between us.