Find Living Relatives

Sorry my apologies

Basically the only information we have about my partners dad is a medical card his mum gave him that belonged to the parent in question

This has his full name, DOB and the full address of where he was living at the time this card was issued... However we cannot find him on any electoral rolls for that address the only ones we could find was giving the wrong information such as the age was coming up as 70+ or the area was Scotland not Yorkshire area as we believe he is still in the area

So we went on GRO and used the information we did have to see if we could find his birth certificate, they helped us and see the us a copy thus giving us the names of both his parents and the address they was living at the time he was born

Okay, so you still need an electoral roll search for the address in 1984 (1983-1985) to see who was living there?

Or I guess the birth certificate solves that question (the names of his parents).

Did you do a search to see whether your partner's dad has brothers and sisters?
At https://www.freebmd.org.uk/cgi/search.pl
you search for births with the same father's and mother's surnames.
FreeBMD might not be up to date for births in the 1960s, so one of us could search the complete index at Ancestry. I'll send you a private message so you will be able to send me messages, too, when your sub expires.

You are going to try to contact his parents at their 2014 address?