You can find friends and families connections through using the Advance Search for witnesses

e.g.

When Samuel MORSE married Mary VAUGHAN - at St Briavels - 21 February 1830

the witnesses were: Joseph DUFTY and Ann DUFTY

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Joseph DUFTY married Ann BALDWIN the year before, 24 December 1829 - to Ann BALDWIN and this witnesses were
Samuel MORSE and Mary VAUGHAN.

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Had a quick look, and at another marriage in St Briavels, 20 June 1837 of
Samuel JONES to Amelia MORSE

the witnesses were: Samuel MORSE and Mary MORSE.