Sounds perfectly reasonable. Most people I know ask for money for birthday.
To call relatives though? That sounds a bit weird. If they ask, sure, but don't call them up be like "Yeah it's Paul's daughter. Its my birthday and I want $20."
To call relatives though? That sounds a bit weird. If they ask, sure, but don't call them up be like "Yeah it's Paul's daughter. Its my birthday and I want $20."