I've now had a look at the Gedcom, and it is Carol's one, but originally I thought it included will transcripts, etc. (perhaps limitations with the format). If you note the death dates you can find the will transcripts on www.iomfhs.im/lawsons/LawsonBMD/wills/_will_index.html?Submit=Wills+and+Transcriptions, plus more recently transcribed ones on lawsonsiom.freevar.com/.
About:
John RADCLIFFE [NI001]
Marriage UNKNOWN - 13 DEC 1712
•BIRTH: UNKNOWN
•DEATH: 13 DEC 1712, Andreas IOM [1]
•WILL: LDS # 0106210
Father: John RADCLIFFE
Family 1 : Alice BREW
•MARRIAGE: UNKNOWN
1. Charles RADCLIFFE
2.+Philip RADCLIFFE
3.+Catherine RADCLIFFE
4. Margaret RADCLIFFE
If you are interested in John & Alice you will find the full details at brew.clients.ch/JurbyIOM.htm#Andreas amongst my BREW family. See the section starting with "v. Alice bapt. April 1689, married [1] John RADCLIFFE of Ballakelly, Andreas, who died 12 December 1712".
This explains how I worked out who John's wife and their children were by looking at Alice's second marriage and various wills, and includes a quote from CR's Ballakelly paragraphs from her article.
Sue