Hi, Sue....
As I was researching, the names (including Radcliffe) were all connected to Killip by marriage. As I found more names, dates and places, I lost any pattern I thought I may have had. I'll have to go through my notes to find the Radcliffe connection, but I don't think I can do much for you.
What I need now is siblings of Thomas Killop, if any, and more definitive information on his parents. What I've seen so far from this list are possibles, but nothing I can really expand into anything usable.
If I can get a better picture of Thomas and the prior generation, I think I can begin expanding using aunts, uncles, cousins, brothers, sisters, etc. All, or just a few, would be OK at this point - just something I can begin following.