I was thinking.....

Sometimes these stupid little thoughts come into my mind and I just can't let them go. I was laying in bed last night watching the news, feeding BabyGolightly and it hit me out of nowhere - If a set of twin sisters marry a set of twin brothers, would their children look exactly alike too? I mean the twin sisters have the same DNA and so do the brothers and if the sisters look exactly alike and the brothers look exactly alike that would mean that both couples' children would have parents that look exactly alike, so would they look exactly alike too? Someone please give me some answer to this so I can let it go.