Good for your brother!
Last Christmas, when DS was about 20 months old, my mom asked him what he wanted for Christmas. Without hesitation he answerd "a baby". So, my mom got him a really sweet little baby doll, the kind that cries, closes her eyes, etc. He LOVED it (still does, actually).
Anyway, a month or so after that, his speech therapist was at our house for his session and Paul was carrying around his "baby". The therapist asked where he got it and I said that his Nana got it for him for Christmas. She made a funny face and said, "I bet Daddy pitched a fit about that one."

I was blown away by the comment. I said that, no, he certainly hadn't. In fact, Paul and Daddy had just been feeding "baby" breakfast together earlier that morning. And, if Daddy had "pitched a fit" over a harmless little baby doll (which he never would have done), I certainly would have set him straight!

You would think that a trained therapist would know the value of role playing toys - dolls, kitchens, whatever - for kids of both sexes!
By the way, Paul is sitting on my lap right now holding his pink balloon. It's the one he picked out yesterday at the store. He could have picked any color, but he wanted pink, so we got him pink. We didn't say, "How about this nice blue one?" or "Wouldn't you rather have the red one?" If the kid wants pink, he gets pink. We've obviously doomed him to a life of gender confusion.
Anyway, hope the OPs son gets his Dora house and I hope he has a BLAST with it!!