We have two dds, 5 and 2 years. Both absolutely love dolls, and spend ages playing together caring for the dolls etc.
dd1 really really wants a twin stroller/buggy. The one I have seen has 2 interactive dolls included.
Would it be ridiculous to buy them the same present? They would both love it, and we could make the space. I think it would be cruel to buy one as it could cause arguments as both would really want it.
Another option is to get one twin stroller, plus a twin cot, and a doll each...would that be fairer?