Kylo Ren

Kylo Ren (birth name Ben Solo) was one of Hans and Leias children, believe it or not! akin to his grandpa, he weilds a red lightsaber and a black mask and somehow got hold of grandpas old mask (which looks to be in tatters somewhat after been burnt up).

While good old Luke said "I can't kill my father", Kylo/Ben/Darth Ren take your pick, was more than happy to and it made him happy to see his dad fall to his doom like that.