This will require some digging. I found Margaret's death in 1888 age 64 in Armadale, she's listed as a widower her son Donald was the informant. It states her parents were Donald McKillop and Catherine Rowan. If you wish a copy of this registration email me. In 1881 I found who I believe is her in Ayr as a widow with her son Archibald (also a coal miner). I looked for a death of an Archibald 1855-1888 and there are many. You will need to go through the death's on Scot's People and find out which is him. I can tell you the one in Ayr is not the one you seek...I looked. Good hunting. Don Muirhead