unknown cousin moves next door

my mother comes from a large family and only kept in contact with a couple of her siblings. when i was growing up i knew one of her sisters lived in Benalla (a town 40 mins drive from the town I grew up in) but I had never met her or her family. I also knew the names of her 5 children but that was all and I never gave them or any of my other estranged relatives a thought over the years. i left home at 17 and moved to melbourne where i lived for 10 yrs and then i moved to Benalla (a town of 8000 people )having by then completely forgotten about the fact that i had relatives living there. after a couple of months the new house next door was completed and i made friends with Cyndie, the young single mum who moved into it. it wasnt until i met her mother, Wilma when she came to visit one day that i finally realized that Cyndie was my cousin. when i put the 2 names (both a little unusual) together I realized.