What is actually the suitable present for the boys?

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I feel so lucky because I am the only girl in my siblings and I have 4 little brothers and 1 big brothers. Living with them is so easy and full of excitement. Although sometimes they are hardly to be handle. It is easy in one way but hard in another way. When it comes to the day of their birth I feel so hard and confius. Should I give them the birthday gives and if yes, what is the most suitable gives? Well it is not so hard to buy a present for a girl but it is so hard for the boys. Is it true or it is just me who make thing harder?