Lower Intermediate - More money than you

How do you relative comparatives? Such as he is the 2nd oldest son, or this is the 3rd tallest building In the world. Those always confuse me! Thanks!

Great thought tomest05, simply you say the number (first, second...) then the comparative. Your examples are:
He is the 2nd oldest son >> هو ثاني أكبر إبن
This is the 3rd tallest building in the world >> هذه ثالث أطول عمارة في العالم

Notice we always use the masculine number (ثاني, ثالث, رابع...) and not feminine form (ثانية, ثالثة, رابعة...) despite that we might be talking about a feminine thing, like (هي رابع أطول بنت في المدرسة).

Hope you find it straightforward.

Honestly, number and gender issue in Arabic is still tricky to me :grrr: Hope I will get used to it Inshallah. ;)