please.....correct me

Hi ..correct me the mistakes or add others words..thanks a lot.

Spendthrifts are people that always are spending a lot money when they don't have a lot of it. they always are spending their money in many things for example in clothes, jewls, ect I think that they are people very irresponsable because they don't save their money. only are spending, for this reason, I think that they should save or budget their money or expensives. I know about this problem because for me is a problem. for example I have one brother that always is spending money athough he don't have it. I don't know where he get it, but he always is spending a lot money.

in conclusion I think that these kinds of people should save a little of money and don't spend a lot.