I dont think Anne was getting revenge on Gideon for Hugh.
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I dont think Lucas ever told her of what Hugh did, and why in the world would one want to have an affair with the man your brother abused... Too close for comfort... just wrong.
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Plus I dont think Hugh would've told her that Gideon approached him in regards to the abuse.
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Lastly, in general I doubt the family knows the real reason why Hugh committed suicide so the revenge there is unjustified.Â
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Lucas hates him because he had an affair with his wife, not because Gideon is the "cause" of Hugh's suicide. So revenge for the suicide is HIGHLY unlikely coming from both Lucas and Anne.Â