To be fair, 'similar age' is not the same as 'same age'. If they are 9 months to a few years apart, they could still be similar ages. I think it was just trying to say that one of them was not a parent. Hell, they could even be half siblings, with the same father and different mothers.Yeah I forgot about her, but your sister is also your twin. Asks you what relationship you have and are similar age. Only thing it can be is twin