Updated : 11/06/2014
NO – To live with you there for less than 3 months, she does not need to register with the authorities, though she might be asked to report her presence. However, she should carry a valid passport at all times - this is sufficient to give her right of residence.
YES - When it comes to residence rights, registered partners enjoy full rights in Holland. The formalities will be the same as if you were married.
However, not all EU countries treat registered partners in the same way – in these countries, your partner's right to stay is not automatic and will be assessed by the national authorities on a case-by-case basis.
NO – Because he is not your dependent direct ascendant or descendant but if the Hungarian authorities refuse residence, they must justify it, which they can do only after extensive research into your personal relationship with your half-brother.