Copmanthorpe's 'family side' have a slender lead at the top of Horwath Pulleyn Heselton York Vale League following their 40-run defeat of Escrick Park.
Dave Purdy (55) outscored his son Steve (50no), while son Andrew Northfield outscored his father Peter.
John Hughes, who had shared an opening stand of 101 with Purdy snr, shared with his son Darren the five wickets that fell to the bowlers.
For Escrick, Richard Sherwood followed his three for 76 with 31 not out and James Reynolds top scored with 67 but had little support.
Melbourne ended North Duffield's winning sequence with a 16-run victory. Tim Stephenson (58) saw them to 176 for six against usual wicketkeeper David Bielby, who, as bowler, took four for 41.
Bielby and Trevor Britain put on 106 for Duffield's third wicket but dropped behind the clock and they fell 17 runs short.
Stillingfleet took top points against Burn. Rob Murray (49) and Dave Rowsby (60) set up their 179 for eight as John Wilson took four for 66.
Burn were all out for 89, Chris Walker taking three for 12 and Neil Alexander three for six.
Woodhouse Grange opener Doug Bartle hit 35 and number eight John Henley 36 out of a total of 127, Mark Miller taking five for 22. United fell ten runs short. The eighth wicket went at 63, Tom Hinch having scored 33. Rob Cole and G Smith took the score to 116 before falling in the last over to Neil Barret (5-33).
Martin Reynolds (83) and Neil Drew (42no) saw Ben Johnson race to 196 for four against Askham Bryan, Tom Hovington taking three for 56.
Askham lost early wickets to Scott Carlton and Steve Wragg. There was a stand of 56 between Chris Parker and Colin Garnett but they slumped to 122 all out.
Andy McEvoy and Rod Croft gave Thorpe a sound start against table-toppers Stockton and Hopgrove in division five. The middle order fell to Michael Collinson (3-29).
Stockton lost both openers cheaply but Barry Sellers (40) and Derek Wilson (30) saw them to a three-wicket win.
Selby's Jim Barr took five for 48 and Chris Jeffreys took five for 30 as Copmanthorpe were dismissed for 109. Selby won with six wickets to spare.
Pocklington 15-year-old Tim Ridgway took four for 12 as visitors Wheldrake were all out for 85. Pocklington were 50 for three then five wickets fell for 16 after Harry Codling came on. Ridgway hit 14 to help his team win by two wickets with seven balls left.
A fifth-wicket stand of 96 between Chris Houseman and Matt Boyle helped York to 173 for seven at home to Tadcaster Magnet.
Tadcaster kept up with the rate but had problems in forcing Tom Copland away, though it was Boyle who won the game for York, taking five for 34 as Tadcaster fell ten runs short.
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