1. He is going to buy eau de toilette for his sister and himself because it is good for boys and girls.
He also plans to get the slippers for his mum and dad.
2. On my opinion the perfume can be expensive for him, as he is going to buy two. ( во втором ответе не было опций, тут предположение что парфюм может быть дорогим)
3. He mentioned his sister, his mum and dad.
