What presents will you buy for your family people on their birthday?

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Tomorrow is my younger sister's birthday and the day after tomorrow is my mother's birthday.I don't know what presents I should send to them.I work in GuangDong province but my hometown is Hunan province, and my mother and younger sister is in my hometown.so I asked my best friend to buy two birthday cakes for them.I think they will be very Happy. Do you have any good advice?