So growing up I spent a lot of time with my mum's extended family - granny and grandpa, aunties and uncles, great aunties (and even one great great aunt), you get the idea.
My dad's family were never in the picture, he never talked about them other than that he didn't get on with his dad and he'd left home at 16. My dad was in his 50s when I was born so I thought it likely by the time I was an adult that other family members might no longer be around.
When my dad died (this is a few years ago now) it kind of came out that the name I knew him by wasn't his name. He'd changed it when he met my mum. I knew where he'd grown up (very small village) and that he'd gone to church regularly, so I managed to find a record of his baptism and therefore his real name, I then did more research, my grandfather had died but only a couple of years before my dad, and there were other family members still living albeit some are in other countries.
Would you make contact with them if you were me? I am wary of stirring up any trouble. For example it seems likely that my dad's dad died a fairly wealthy man, I wouldn't want relatives thinking I was looking for a handout (my dad left no assets). I also don't fully know the background to him leaving, and I wonder whether there are lots of skeletons that maybe should be left in the past. My dad had 60 years to contact them and apparently didn't.