Sussex Schools' under-18s beat Hampshire 32-19 to maintain their unbeaten start to the season.
A try by Brown and penalty from Sequin following good work by Redmayne put them ahead before Hants reduced the arrears to 8-7.
Tries by Power (2), Gray and Essex extended Sussex's advantage until their opponents replied in injury time.
It follows Sussex Clubs' under-18s' 18-15 victory against the same county.
Sussex Schools' under-18s meet Eastern Counties at Southend on Sunday while the Clubs' under-18s are at Thurrock.
Sussex under-16s play Hampshire at Waterhall, Brighton, tonight (7pm) and host Surrey on Sunday (12 Noon).
Hove Park missed two late penalties and were held on the line on three occasions as they were pipped 12-10 by impressive Brighton College in the third round of the Daily Mail Schools Cup.
Harlequin's scholar Kiba Richards showed his pace with two excellent tries either side of half-time for the College. Hove Park came back with two tries in the last ten minutes.
Injury-hit Brighton under-15s won 28-17 at Buckinghamshire champions Marlow.
The hosts scored a converted try and added a penalty for a 10-0 lead.
Brighton came back with converted tries by Ben Rogers and Tom Peissel to lead at the interval.
In the second half, further tries were added by Jamie Brown and James Trevis while Marlow replied with a touch down. John Taylor kicked all four Brighton conversions.
Brighton under-8s, 10s, 12s and 14s played Tabard in a Minis Challenge at Premiership club Saracens at Watford.
The two youngest age groups won and the under-12s completed a hat-trick with a 15-5 victory thanks to tries by Craig Holland, Harvey Packham and Alex Spurgeon. The under-14s were pipped. Brighton under-9s formed the guard of honour for Saracens and London Irish 1st XVs before their Zurich Premiership fixture.
Haywards Heath under-13s kick off their Sussex League season against Uckfield at Whiteman's Green on Sunday (12.45pm).
Squad: Tim Carrington, Ross Chisholm, Max Drage, Jamie Duffell, Jim Dykes, Adam Galbraith, Alex Graham, Toby Glenn, Andrew Hadden, Joe Hallam, Eoghan Healy, Charlie Lennon, Dan Levene, Matt Lilburne, Max Maidment, Matthew Naish, Chris Preston-Bell, Tom Richardson, Matt Quinn, Elliot Wise, Jonathan Woodward.
They were beaten 24-0 at Effingham in a friendly.
Heath sponsors a Day of Rugby for 13-14-year-olds from eight Mid Sussex schools tomorrow. The club will provide coaching and training before staging a tournament.
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