Amycus exited the bedroom of the older Marchwoods and followed his sister upstairs where he did nothing more then watch her work. They both had their strengths, and Alecto's was most certainly the Imperius curse. Amycus smiled as he watched his sister work her spells on the brats.
Afterwards she turned to him and he looked at her. "Yes...let's leave no traces that we were here." Amycus walked back downstairs and made sure that Alecto and he were both out of the way as he pulled out his wand and did his best to reset the ward that the family had...and then locked the front door as it had been before they entered.
"Lets get out of here and report back to the Dark Lord.." and with that Amycus apparated from their living room back to Voldemort.