Howard Rubin was dressing up in costumes from the Disney flick “Frozen’’ and turning his living room into a playground for his grandkids when he wasn’t allegedly torturing women in his sex dungeon.

The retired mega-financier’s daughter Annalee Rubin tried peddling the heartwarming details about her accused sex-trafficking dad while describing him as a “devoted and loving’’ grandfather in a recent letter to a Brooklyn federal judge. 6

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Annalee, who is now seven months pregnant with her fourth child, wrote the gushing missive to try to get Rubin, 70, sprung from jail while he awaits trial on charges he and personal assistant Jennifer Powers trafficked women to his penthouse-turned-dungeon.

Her bid ultimately failed, with the judge Monday ordering Rubin to remain behind bars, sayi

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