According to A.W.Moore, Samsbury's Radcliffe descendants ended with Samuel 1768-1837.
See: www.isle-of-man.com/manxnotebook/famhist/families/awm1889/rdclif_g.htm

You certainly can't assume that FamilySearch is correct, especially with the contributed pedigrees which are not checked for accuracy, and where gaps are often filled with guesses.

You will only get an accurate tree if you do it the old-fashioned way, one generation at a time going back, and checking original sources (or scans or films of these) for each item of information before moving back another generation.

Sue