Spain:
Infanta Elena looks a lot like Queen Sofía to me, a little Froilán looks a lot like his mother. There's a picture posted in the picture thread for Froilán of him being held by his grandmother when he was about one or two years old and he looks like a wee male version of her. Victoria favours her mother and grandmother as well, but not as much as her brother.
I think all of Infanta Cristina's bairns look like their father, lol. I can't see any resemblance to their mother in them.
Prince Felipe looks like a mixture between his father and mother. I can see both of them in him in different photographs. In some pics he looks dead on his father, in others, he favours his mother. He also looks remarkably similar to his cousin, Prince Pavlos of Greece.
Monaco:
Princess Caroline looks very simliar to her paternal grandmother, Charlotte.
Prince Albert is a likeness of his mother, Grace.
Princess Stéphanie is a little more difficult to discern. She has the colouring of her father, but when she was a small child, she looked very much like her maternal aunt, Lizanne (was that her name?). Camille is more of a combo of Lizanne and Grace.
Louis Ducruet looks like his father and Pauline has some physical traits her her mother, but I wouldn't say she's a spitting image of her.
Andrea Casiraghi is a spitting image of his father with his maternal grandmother's colouring. Charlotte is a spitting image of her mother and Pierre's looks are lost upon me. He has Grace's colouring, but I don't really see the source of his looks. Princess Alexandra is a replica of her father.
Greece:
I haven't seen many pictures of the Greek royal family, but of the pictures of Princess Maria-Olympia, she looks very much like her mother, Marie-Chantal.
Britain:
Prince Harry looks like a blend between the Duke of Edinburgh and his Spencer cousins. I remember watching the funeral of the Princess of Wales and seeing one of the Spencer grandkids and thinking it was Harry. I don't know whether it was Alexander Fellowes or George McCorquodale. Does anyone have pictures for comparison?
Prince William is a blend of his parents. The older he gets, the more like Charles he looks. He has the best of both his parents.
The late Princess of Wales favours her mother to a tee. Remarkably similar they were.
Laura Parker Bowles looks a lot like her mother, but I'm unsure of whom Andrew favours. His father, perhaps?
Viscount Linley and Lady Sarah Chatto are chameleons, lol. In some pictures they look like their mother, but in some they strongly resemble their father. Lady Sarah and her half-sister, Lady Frances look very much alike.
Russia:
I'm not sure if we're only discussing present day royals, but I've always been interested in the Romanovs and their looks. Of the five children of Czar Nikolai and Czarina Aleksandra, none of them really looked alike. Olga and Anastasia probably came the closest to resembling each other because they resembled their mother (Anastasia moreso). I have no idea who Tatiana and Maria took after in their looks, but Aleksey favoured his father greatly.
There's a famous photograph of Nikolai standing alongside his cousin Edward and another cousin (Wilhelm??) and all three look like identical triplets. Does anyone happen to have this picture? I'd love to see it. The resemblance is startling.